A connector is mateable with a mating connector having a mating terminal. The connector comprises a housing and a terminal held by the housing. The housing has an accommodating portion and a lock portion which are formed integrally. The terminal is accommodated in the accommodating portion so as to be connectable to the mating terminal. When the connector is in a mated state where the connector is mated with the mating connector, the lock portion locks the mated state. In detail, the lock portion has a flexible portion and a lock protrusion. The flexible portion is located over the accommodating portion. The lock protrusion is provided on the flexible portion. No wall is provided between the flexible portion and the accommodating portion so that the flexible portion is resiliently deformable toward the accommodating portion. The lock protrusion moves downward when the flexible portion is resiliently deformed downward.