An expansion valve (1,201,301): that is provided in a refrigeration cycle; that throttles and expands a refrigerant flown in via an external heat exchanger by making the refrigerant pass through a valve portion in an inside thereof to supply to an evaporator; and that controls an opening degree of the valve portion by sensing a pressure and a temperature of the refrigerant that has returned from the evaporator and delivers the refrigerant toward a compressor, the expansion valve comprising: a first refrigerant passage that is formed so as to penetrate a body (2,202,302) thereof, and at one end side of which a first inlet port for introducing the refrigerant from the external heat exchanger is provided, while at the other end side of which a first outlet port for delivering the refrigerant to the evaporator is provided; a valve hole provided in an intermediate portion of the first refrigerant passage; a valve chamber provided between the valve hole and the first inlet port in the first refrigerant passage; a valve element that is arranged in the valve chamber for opening and closing the valve portion by touching and leaving the valve hole; a second refrigerant passage that is formed separately from the first refrigerant passage so as to penetrate the body (2,202,302) thereof, and at one end side of which a second inlet port for introducing the refrigerant that has returned from the evaporator is provided, while at the other end side of which a second outlet port for delivering the refrigerant to the compressor is provided; a power element that is provided on a side opposite to the first refrigerant passage with respect to the second refrigerant passage in the body (2,202,302), and that works by sensing the temperature and pressure of the refrigerant flowing through the second refrigerant passage; an actuating rod (33,233) whose one end side crosses the second refrigerant passage to be connected to the power element and whose other end side penetrates both a partition wall between the first refrigerant passage and the second refrigerant passage and the valve hole to be connected to the valve element, and that transmits the drive force of the power element to the valve element; and a mounting hole that has its central axis at a height position between the first refrigerant passage and the second refrigerant passage in the body (2,202,302), and that is provided so as to penetrate both a first side surface, on which the first outlet port and the second inlet port are opened, and a second side surface located on a back surface side of the first side surface, and that is used for inserting, from the side of the second side surface, a screw for tightening a mounting member on the evaporator side and the body (2,202,302) together, characterized in that the mounting hole has, in an inside thereof, a stopper surface (70,170) for stopping the head (66,166) of the screw in an insertion direction, and the stopper surface (70,170) is formed so as to be located near to the first side surface relative to a central axis of the actuating rod (33,233). a first refrigerant passage that is formed so as to penetrate a body (2,202,302) thereof, and at one end side of which a first inlet port for introducing the refrigerant from the external heat exchanger is provided, while at the other end side of which a first outlet port for delivering the refrigerant to the evaporator is provided; a valve hole provided in an intermediate portion of the first refrigerant passage; a valve chamber provided between the valve hole and the first inlet port in the first refrigerant passage; a valve element that is arranged in the valve chamber for opening and closing the valve portion by touching and leaving the valve hole; a second refrigerant passage that is formed separately from the first refrigerant passage so as to penetrate the body (2,202,302) thereof, and at one end side of which a second inlet port for introducing the refrigerant that has returned from the evaporator is provided, while at the other end side of which a second outlet port for delivering the refrigerant to the compressor is provided; a power element that is provided on a side opposite to the first refrigerant passage with respect to the second refrigerant passage in the body (2,202,302), and that works by sensing the temperature and pressure of the refrigerant flowing through the second refrigerant passage; an actuating rod (33,233) whose one end side crosses the second refrigerant passage to be connected to the power element and whose other end side penetrates both a partition wall between the first refrigerant passage and the second refrigerant passage and the valve hole to be connected to the valve element, and that transmits the drive force of the power element to the valve element; and a mounting hole that has its central axis at a height position between the first refrigerant passage and the second refrigerant passage in the body (2,202,302), and that is provided so as to penetrate both a first side surface, on which the first outlet port and the second inlet port are opened, and a second side surface located on a back surface side of the first side surface, and that is used for inserting, from the side of the second side surface, a screw for tightening a mounting member on the evaporator side and the body (2,202,302) together, characterized in that the mounting hole has, in an inside thereof, a stopper surface (70,170) for stopping the head (66,166) of the screw in an insertion direction, and the stopper surface (70,170) is formed so as to be located near to the first side surface relative to a central axis of the actuating rod (33,233).