To shorten a contact member to a fit-in direction to allow a decrease size, a fixing piece 12c of a contact member 12 is arranged in a region Q where an electrode part 22a of a mating connector 20 slides over the contact member 12. Thus, the region Q where the electrode part 22a of the mating connector 20 slides over the contact member 12 and a region where the fixing piece 12c of the contact member 12 is arranged are in a state of overlapping each other in a direction of fitting in the mating connector 20, and the contact member 12 can be shortened to the direction of fitting in the mating connector 20.