A connector housing (10) is formed with a seal tower (18) projecting backward from the rear surface of the connector housing and adapted to accommodate seals (20). A peripheral wall (21) surrounds the seal tower (18) and projects back from the rear surface of the connector housing (10). A rearwardly open groove-shaped annular recess (22) is formed between the seal tower (18) and the peripheral wall (21) and has a bottom surface (23) that defines the rear surface of the connector housing. The bottom surface (23) of the recess (22) is continuous over the entire circumference, and the peripheral wall (21) is formed with water drains (24) that cause the inside of the recess and an outer peripheral side of the peripheral wall to communicate.