A connector includes a housing including a terminal reception chamber in which a terminal can be received, and a front holder that is attached to the housing so as to double-lock the terminal in the terminal reception chamber, wherein the front holder includes a plate-like rib portion extending in a direction crossing a fitting direction of the front holder, the housing includes a groove portion and a mountain-like protrusion portion in a mounting position where the front holder is mounted, the groove portion being recessed into a shape that can receive the rib portion while supporting the rib portion, the groove portion extending in a direction in which the rib portion extends, the protrusion portion protruding in an extension direction of the groove portion and extending in the fitting direction of the front holder.