Vehicle seat

1. A vehicle seat comprising:

a seat pad configured to support an occupant, the seat pad having a through-hole provided so as to extend through the seat pad in a direction from an occupant sitting side toward a side opposite to the occupant sitting side; and

a frame member attached to an opening end of the through-hole on the occupant sitting side, the frame member having an opening configured such that a fixation connecting portion of a child safety seat is inserted into the opening, wherein

the frame member is provided with an attaching portion attached to the seat pad,

the seat pad includes an attachment pad portion provided integrally with an attachment member including an attachment portion to which the attaching portion of the frame member is attached, the attachment pad portion constituting a part of an inner wall surface of the through-hole,

the attachment portion of the attachment member is disposed between the attachment pad portion and the attaching portion of the frame member, and

the attaching portion of the frame member is fixed to the attachment portion of the attachment member with a fixing member.

2. The vehicle seat according to claim 1 , wherein a wire member to which the attachment member is attached is embedded in the attachment pad portion.

3. The vehicle seat according to claim 1 , wherein the frame member includes a frame body portion having the opening, and an attachment extension portion extending from the frame body portion toward the seat pad, the attachment extension portion including the attaching portion.

4. The vehicle seat according to claim 3 , wherein in the frame member, the attachment extension portion has a recessed portion that is recessed toward the attachment member, and the attaching portion is provided in the recessed portion.

5. The vehicle seat according to claim 3 , wherein in the frame member, the attachment extension portion includes an attachment locking portion locked to the attachment pad portion.

6. The vehicle seat according to claim 1 , wherein the attachment portion of the attachment member is covered with a covering material covering the seat pad.

7. The vehicle seat according to claim 6 , wherein the covering material covering the attachment portion of the attachment member is fixed, with the fixing member, to the attachment portion of the attachment member together with the attaching portion of the frame member.

8. The vehicle seat according to claim 1 , wherein the seat pad is a cushion pad disposed inside a seat cushion configured to support buttocks of the occupant.

9. The vehicle seat according to claim 8 , wherein:

the cushion pad includes a pad body portion, and a pad projecting portion projecting from the pad body portion toward a seatback configured to support a back of the occupant; and

the through-hole and the attachment pad portion are provided in the pad projecting portion.

10. The vehicle seat according to claim 9 , wherein the attaching portion of the frame member and the attachment portion of the attachment member, which are fixed with the fixing member, are covered by the seatback.

11. A vehicle seat comprising:

a seat pad configured to support an occupant, the seat pad having a through-hole provided so as to extend through the seat pad in a direction from an occupant sitting side toward a side opposite to the occupant sitting side; and

a frame member attached to an opening end of the through-hole on the occupant sitting side, the frame member having an opening configured such that a fixation connecting portion of a child safety seat is inserted into the opening, wherein

the frame member is provided with an attaching portion attached to the seat pad,

the seat pad includes an attachment pad portion provided integrally with an attachment member including an attachment portion to which the attaching portion of the frame member is attached, the attachment pad portion constituting a part of an inner wall surface of the through-hole,

a wire member to which the attachment member is attached is embedded in the attachment pad portion, and

the attaching portion of the frame member is fixed to the attachment portion of the attachment member with a fixing member.

12. A vehicle seat comprising:

a seat pad configured to support an occupant, the seat pad having a through-hole provided so as to extend through the seat pad in a direction from an occupant sitting side toward a side opposite to the occupant sitting side; and

a frame member attached to an opening end of the through-hole on the occupant sitting side, the frame member having an opening configured such that a fixation connecting portion of a child safety seat is inserted into the opening, wherein

the frame member is provided with an attaching portion attached to the seat pad,

the seat pad includes an attachment pad portion provided integrally with an attachment member including an attachment portion to which the attaching portion of the frame member is attached, the attachment pad portion constituting a part of an inner wall surface of the through-hole,

the attaching portion of the frame member is fixed to the attachment portion of the attachment member with a fixing member, and

the attachment portion of the attachment member is covered with a covering material covering the seat pad.