A connector (1) includes a first terminal with a first flange, a second terminal with a second flange, a housing (10) having first and second accommodating portions (14, 16), and a retainer. The first terminal is at a proper position in a front-rear direction in the housing (10) by being in the first accommodating portion (14) with the first flange locked by a first lock in the first accommodating portion (14). The second terminal is at a proper position in a front-rear direction in the housing (10) by being in the second accommodating portion (16) and having the second flange locked by a second lock in the second accommodating portion (16), but is rearward of the proper position in the front-rear direction when the second terminal is in the first accommodating portion (14) and the second flange is locked by the first lock.