A connector with a connection verifying mechanism is made with a relatively small number of components, and to reduce movement of a locking member that undetachably fixes a counterpart for size reduction. The connector (1) includes a housing (3) having an insertion hole (4) into which a pipe (2) is inserted, a locking member (5) that is attached to the housing and driven from an initial position to a locked position by the pipe to undetachably fix the pipe at the locked position and an identifying member (6) that is provided in the housing and has display pieces (74, 74) that differ from the locking member in color, and the locking member shield the display pieces at the initial position and exposes the display pieces at the locked position.