A connector comprising: a metal piece; a contact assembly including a body which fixes a plurality of contacts; a housing in which the contact assembly is inserted in a connector inserting direction to be accommodated; and an arm portion which is extended in an arrangement direction of the contacts; characterized in that the housing includes a concave portion which has a lateral wall which is opposed to a connector pulling-out direction, and a hole which is formed on a bottom surface of the concave portion, the body includes a recess which has a lateral wall which is opposed to the connector inserting direction, and the metal piece includes an L-shaped portion which is formed in a manner to be bent in a direction orthogonal to both of an extending direction of the arm portion and the connector inserting direction, and of which an end surface, in the connector pulling-out direction, is brought into contact only with the lateral wall of the concave portion of the housing in a case of connection with the housing, and a pressing portion which is formed by extending an end surface, in the connector inserting direction, of the L-shaped portion in a forward direction or an opposite direction of the extending direction of the arm portion, and which pressing portion protrudes from the hole to be brought into contact only with the lateral wall of the recess of the body in a case of connection with the housing and the body. a metal piece; a contact assembly including a body which fixes a plurality of contacts; a housing in which the contact assembly is inserted in a connector inserting direction to be accommodated; and an arm portion which is extended in an arrangement direction of the contacts; characterized in that the housing includes a concave portion which has a lateral wall which is opposed to a connector pulling-out direction, and a hole which is formed on a bottom surface of the concave portion, a concave portion which has a lateral wall which is opposed to a connector pulling-out direction, and a hole which is formed on a bottom surface of the concave portion, the body includes a recess which has a lateral wall which is opposed to the connector inserting direction, and a recess which has a lateral wall which is opposed to the connector inserting direction, and the metal piece includes an L-shaped portion which is formed in a manner to be bent in a direction orthogonal to both of an extending direction of the arm portion and the connector inserting direction, and of which an end surface, in the connector pulling-out direction, is brought into contact only with the lateral wall of the concave portion of the housing in a case of connection with the housing, and an L-shaped portion which is formed in a manner to be bent in a direction orthogonal to both of an extending direction of the arm portion and the connector inserting direction, and of which an end surface, in the connector pulling-out direction, is brought into contact only with the lateral wall of the concave portion of the housing in a case of connection with the housing, and a pressing portion which is formed by extending an end surface, in the connector inserting direction, of the L-shaped portion in a forward direction or an opposite direction of the extending direction of the arm portion, and which pressing portion protrudes from the hole to be brought into contact only with the lateral wall of the recess of the body in a case of connection with the housing and the body.