Connector assembly

1. A connector assembly comprising:

a first connector comprising a plurality of first contacts, a first housing holding the plurality of first contacts, and a first auxiliary fitting attached to the first housing, the first connector being mountable on a first circuit board; and

a second connector comprising a plurality of second contacts, a second housing holding the plurality of second contacts, and a second auxiliary fitting attached to the second housing, the second connector being mountable on a second circuit board, wherein

the first connector is mated with the second connector to bring each first contact into electrical contact with each second contact,

the first auxiliary fitting includes a first side-surface facing portion facing a side surface of the first housing,

the first side-surface facing portion includes:

a first electrical connecting portion configured to come into electrical contact with the second auxiliary fitting; and

a first mating lock portion that cooperates with the second auxiliary fitting to prevent a mating state between the first connector and the second connector from being released,

the first electrical connecting portion and the first mating lock portion are positioned in a single plane,

the first electrical connecting portion and the first mating lock portion are, in a direction parallel to a first connector mounting surface of the first circuit board, adjacent to each other with a gap opened toward the first connector mounting surface of the first circuit board interposed therebetween, and

the first mating lock portion is provided with a soldering portion solderable to the first connector mounting surface of the first circuit board.

2. The connector assembly according to claim 1 , wherein the first electrical connecting portion is farther from the plurality of first contacts than the first mating lock portion is.

3. The connector assembly according to claim 2 , wherein

the second auxiliary fitting includes:

a second electrical connecting portion configured to come into electrical contact with the first electrical connecting portion; and

a second mating lock portion that cooperates with the first mating lock portion to prevent the mating state between the first connector and the second connector from being released,

the second electrical connecting portion extends toward the second mating lock portion in a cantilever manner, and

the second electrical connecting portion includes a free end portion at which an electrical contact portion configured to come into electrical contact with the first electrical connecting portion is arranged.

4. The connector assembly according to claim 3 , wherein the second auxiliary fitting includes a protecting portion covering the second electrical connecting portion in a direction perpendicular to a second connector mounting surface of the second circuit board.

5. The connector assembly according to claim 3 , wherein the second auxiliary fitting includes a protecting portion covering the second housing and the second electrical connecting portion in a direction perpendicular to a second connector mounting surface of the second circuit board.

6. The connector assembly according to claim 1 , wherein

due to the gap opened toward the first connector mounting surface of the first circuit board, the first side-surface facing portion is formed in a U-shape that opens toward the first connector mounting surface of the first circuit board, and

the first side-surface facing portion further includes a coupling portion coupling the first electrical connecting portion with the first mating lock portion.

7. The connector assembly according to claim 6 , wherein the first mating lock portion is formed with a lock portion including at least one of a projection, a recess, or a hole.

8. The connector assembly according to claim 7 , wherein the lock portion is formed over the first mating lock portion, the coupling portion, and the first electrical connecting portion in a seamless manner.

9. The connector assembly according to claim 7 , wherein the lock portion is formed apart from the gap.

10. A connector assembly having a longitudinal direction and a width direction that is perpendicular to the longitudinal direction, the connector assembly comprising:

a first connector comprising a plurality of first contacts, a first housing holding the plurality of first contacts, and a first auxiliary fitting attached to the first housing, the first connector being mountable on a first circuit board; and

a second connector comprising a plurality of second contacts, a second housing holding the plurality of second contacts, and a second auxiliary fitting attached to the second housing, the second connector being mountable on a second circuit board, wherein

the first connector is mated with the second connector to bring each first contact into electrical contact with each second contact,

the first auxiliary fitting includes a first side-surface facing portion facing a side surface of the first housing in the width direction,

the first side-surface facing portion includes:

a first electrical connecting portion configured to come into contact with the second auxiliary fitting and to form an electrical connection with the second auxiliary fitting; and

a first mating lock portion that cooperates with the second auxiliary fitting to prevent a mating state between the first connector and the second connector from being released,

the first electrical connecting portion and the first mating lock portion are, in a direction parallel to a first connector mounting surface of the first circuit board, adjacent to each other with a gap opened toward the first connector mounting surface of the first circuit board interposed therebetween, and

the first mating lock portion is provided with a soldering portion solderable to the first connector mounting surface of the first circuit board.