A backlash elimination structure of a connector includes a first contact point of a detection member contacting a first target sliding portion of a housing in a temporary locked state release operation direction of a detection member between a temporary locking position and a main locking position of the detection member, and a second contact point contacting a second target sliding portion of the housing in a direction opposite to the release operation direction therebetween. The first contact point and the second contact point are disposed to be displaced from each other in a relative movement direction of the detection member. The detection member includes a base body which is separated from a wall portion, a wall body which connects the base body and the first contact point to each other, and a first target locking body which is disposed to be separated from the wall portion.