Connector

A connector comprising:

• a housing that has an engagement hole formed so as to be open in a first direction and an engagement portion disposed at each of a pair of inner wall surfaces facing each other in a second direction in an inner peripheral wall of the engagement hole where the first direction, the second direction, and a third direction are defined as mutually-orthogonal three directions;
• and
• a retainer that is inserted and fitted into the engagement hole from the first direction,
• the retainer including:
• a pair of first outer surfaces facing each other in the first direction;
• a pair of second outer surfaces facing each other in the second direction;
• a pair of third outer surfaces facing each other in the third direction;
• a long hole that is adjacent to each of the second outer surfaces, that passes through the third outer surface in the third direction and that extends in the first direction defined as a longitudinal direction;
• a beam portion that is formed between the long hole and a corresponding one of the second outer surfaces, that extends in the first direction defined as a longitudinal direction, and that is supported at both ends by a pair of longitudinal-direction end portions;
• an engagement projection that protrudes outwardly from an intermediate portion in the longitudinal direction of the beam portion and that engages with a corresponding one of the engagement portions;
• and
• a stress relaxation structure that relaxes stress acting on the intermediate portion in the longitudinal direction of the beam portion,
• the stress relaxation structure including a hole expanding portion that expands at least one of the pair of longitudinal-direction end portions of the long hole in a lateral direction.