A connector comprising: a terminal comprising a contact surface on the opposite side of a back surface of the terminal in a plate thickness direction and configured to be electrically contacted with a connection target; a housing made of an insulating material and configured to be placed on a substrate, the housing including: a fitting portion provided inside the housing and configured to be fitted on the connection target in a fitting direction; an accommodating portion for accommodating the terminal, which accommodating portion comprises a regulating surface (24, 26, 82) for regulating a displacement of the terminal, the regulating surface (24, 26, 82) comprising side regulating surfaces facing side surfaces of the terminal and a bottom regulating surface (26, 82) facing and being in contact with the back surface of the terminal along the fitting direction; and characterized in that a recess (58, 84) is formed on the bottom regulating surface (26, 82) at least at a position along the fitting direction at which the terminal contacts the connection target, the recess (58, 84) having a bottom surface made of the insulating material and a space being formed between the bottom surface of the recess (58, 84) and the terminal, and wherein a front end of the recess (58, 84) in the fitting direction is located behind a front end of the terminal at a position along the fitting direction on the bottom regulating surface (26, 82) at which the terminal contacts the connection target and the front end is covered by the terminal. a terminal comprising a contact surface on the opposite side of a back surface of the terminal in a plate thickness direction and configured to be electrically contacted with a connection target; a housing made of an insulating material and configured to be placed on a substrate, the housing including: a fitting portion provided inside the housing and configured to be fitted on the connection target in a fitting direction; an accommodating portion for accommodating the terminal, which accommodating portion comprises a regulating surface (24, 26, 82) for regulating a displacement of the terminal, the regulating surface (24, 26, 82) comprising side regulating surfaces facing side surfaces of the terminal and a bottom regulating surface (26, 82) facing and being in contact with the back surface of the terminal along the fitting direction; and a fitting portion provided inside the housing and configured to be fitted on the connection target in a fitting direction; an accommodating portion for accommodating the terminal, which accommodating portion comprises a regulating surface (24, 26, 82) for regulating a displacement of the terminal, the regulating surface (24, 26, 82) comprising side regulating surfaces facing side surfaces of the terminal and a bottom regulating surface (26, 82) facing and being in contact with the back surface of the terminal along the fitting direction; and characterized in that a recess (58, 84) is formed on the bottom regulating surface (26, 82) at least at a position along the fitting direction at which the terminal contacts the connection target, the recess (58, 84) having a bottom surface made of the insulating material and a space being formed between the bottom surface of the recess (58, 84) and the terminal, and wherein a front end of the recess (58, 84) in the fitting direction is located behind a front end of the terminal at a position along the fitting direction on the bottom regulating surface (26, 82) at which the terminal contacts the connection target and the front end is covered by the terminal.