A connector is provided, by which deformation or damage of a locking arm is prevented, a secure holding force of the locking arm is assured, and the connector is stably held in a hole of a panel. The connector includes: a first connector housing to be allowed to pass through a hole of a panel; a locking arm formed on the first connector housing, the locking arm being resiliently deformed to be locked to an inner edge of the hole when the first connector housing is allowed to pass through the hole; a second connector housing to be fit to the first connector housing; and a displacement preventing means for preventing the locking arm from being displaced in a direction crossing a direction in which the locking arm is resiliently deformed.