A first contact part (102) includes: a first base material (101A); a first plated layer (101B) formed on a first outer surface of the first base material; and an indent part (104). A second contact part (112) includes a second base material (111A) and a second plated layer (111B) formed on a second outer surface of the second base material. The indent part (104) in the terminal insertion completion position comes into contact with the contact surface (112a) of the second contact part (112) due to a contact load. The first outer surface of the first base material (101A) of the indent part (104) and/or the second outer surface of the second base material (111A) at the contact surface (112a) has asperities (111d).
