Abstract: A terminal unit 1 includes: a terminal fitting 10; and a holder 50. The terminal fitting 10 includes a connection portion 10A in which a bolt insertion hole 10C is formed, and the holder 50 includes a main body portion 50A that is configured to be attached to the connection portion 10A and a detent 50B that protrudes from the main body portion 50A and prevents the terminal fitting 10 from rotating.

Abstract: A connector is provided with a first housing, a second housing to be stacked on and coupled to the first housing and a mating housing to be connected to the first housing and the second housing. The mating housing includes a projecting portion to be arranged between first and second facing surfaces of the first housing and the second housing and capable of contacting the respective facing surfaces of the first housing and the second housing.

Abstract: Each of two plug connectors includes a main body configured to retain a plurality of electric wires and a pair of push members protruding from both sides of the main body along a first direction. In connector mating operation, the two plug connectors are respectively inserted into associated receptacle connectors in a state where the two plug connectors are mechanically coupled or bound to a relative positional relationship by a jig in a position where the pair of push members in one of the two plug connectors are displaced from the pair of push members in the other of the two plug connectors along a second direction orthogonal to the first direction.