Connection fastener

1. A connection fastener comprising:

a plurality of fasteners each of which includes a head portion provided at one end portion side and a tapered leading end portion provided at the other end portion side;

a sheet-shaped connection portion that is configured to connect the plurality of fasteners in a parallel direction; and

attaching portions that are separate from the connection portion attached to the fasteners such that each attaching portion covers at least one part of each leading end portion,

wherein the connection portion includes:

first holding portions each of which is configured to support a head portion side of each fastener; and

second holding portions each of which is configured to support at least one part of a circumferential surface of each attaching portion, and

wherein:

the connection portion includes second holding holes which support the attaching portions provided at the second holding portions, and first holding holes which support the head portion sides of the fasteners provided at the first holding portions; and

diameters of the second holding holes are larger than diameters of the first holding holes.

2. The connection fastener according to claim 1 , wherein:

each of the fasteners includes a shank continuously provided between the head portion and the leading end portion; and

the second holding portions support the attaching portions at positions at which the second holding portions overlap the tapered leading end portions of the fasteners or at positions at which the second holding portions do not overlap the fasteners, when viewed from a side direction of the fastener.

3. The connection fastener according to claim 1 , wherein:

the connection portion is formed by bending one long sheet in a C shape;

the first holding portions, the second holding portions, and a band-shaped portion connecting the first holding portions and the second holding portions are formed on the same plane in the long sheet;

each of the fasteners includes a shank continuously provided between the head portion and the leading end portion; and

in an axial direction of the fastener, a length of the shank is shorter than a length of the band-shaped portion.

4. The connection fastener according to claim 3 , wherein:

each fastener includes a stepped portion at the shank; and

the stepped portion is formed such that an outer diameter of a leading end portion side is smaller than an outer diameter of the head portion side, and faces an upper edge portion of the attaching portion.

5. A connection fastener comprising:

a plurality of fasteners each of which includes a head portion provided at one end portion side and a tapered leading end portion provided at the other end portion side;

a sheet-shaped connection portion that is configured to connect the plurality of fasteners in a parallel direction; and

attaching portions that are separate from the connection portion attached to the fasteners such that each attaching portion covers at least one part of each leading end portion,

wherein the connection portion includes:

first holding portions each of which is configured to support a head portion side of each fastener; and

second holding portions each of which is configured to support at least one part of a circumferential surface of each attaching portion, and,

wherein:

the connection portion includes second holding holes which support the attaching portions provided at the second holding portions, and first holding holes which support the head portion sides of the fasteners provided at the first holding portions; and

opening widths of opening slits of the second holding holes are larger than opening widths of opening slits of the first holding holes.

6. A connection fastener comprising:

a plurality of fasteners each of which includes a head portion provided at one end portion side and a tapered leading end portion provided at the other end portion side;

a sheet-shaped connection portion that is configured to connect the plurality of fasteners in a parallel direction; and

attaching portions that are separate from the connection portion attached to the fasteners such that each attaching portion covers at least one part of each leading end portion,

wherein the connection portion includes:

first holding portions each of which is configured to support a head portion side of each fastener; and

second holding portions each of which is configured to support at least one part of a circumferential surface of each attaching portion, and

wherein:

each of the attaching portions includes a flange portion protruding in an outer circumferential direction below the second holding portion.

7. A connection fastener comprising:

a plurality of fasteners each of which includes a head portion provided at one end portion side and a tapered leading end portion provided at the other end portion side;

a sheet-shaped connection portion that is configured to connect the plurality of fasteners in a parallel direction; and

attaching portions that are separate from the connection portion attached to the fasteners such that each attaching portion covers at least one part of each leading end portion,

wherein the connection portion includes:

first holding portions each of which is configured to support a head portion side of each fastener; and

second holding portions each of which is configured to support at least one part of a circumferential surface of each attaching portion, and

wherein:

each of the attaching portions includes a fall-preventing shape for preventing the second holding portion from falling off.

8. The connection fastener according to claim 7 , wherein the fall-preventing shape is a tapered shape which diameter is gradually increased toward a leading end portion side of the fastener.

9. The connection fastener according to claim 7 , wherein the fall-preventing shape is a stepped shape formed by making a large diameter of the attaching portion in a leading end portion side of the fastener or a concave shape of a circumferential groove shape.

10. The connection fastener according to claim 7 , wherein the fall-preventing shape is a bulgy shape in which the attaching portion in the head side of the fastener is swollen in an outer circumferential direction or a large diameter shape formed by making a large diameter of the attaching portion in the head side of the fastener.