A control valve comprising: a valve body which is provided with a main valve chamber and first and second inlet/outlets (11; 12) and in which an inlet is opened to a bottom portion of the main valve chamber and first and second outlets (13a; 13b) are opened to a side portion of the main valve chamber; a main valve body which is disposed in the main valve chamber to be elevatable relative to the inlet in order to control a flow rate of a fluid flowing in the inlet; and an elevation drive source which elevates the main valve body relative to the inlet, wherein a first bottom portion differential pressure valve allowing a fluid to flow only in a direction from the first inlet/outlet to the inlet in response to a differential pressure between the first inlet/outlet and the inlet is disposed between the first inlet/outlet and the inlet inside the valve body, a second bottom portion differential pressure valve allowing a fluid to flow only in a direction from the second inlet/outlet to the inlet in response to a differential pressure between the second inlet/outlet and the inlet is disposed between the second inlet/outlet and the inlet inside the valve body, a first side portion differential pressure valve allowing a fluid to flow only in a direction from the first outlet to the first inlet/outlet in response to a differential pressure between the first outlet and the first inlet/outlet is disposed between the first outlet and the first inlet/outlet inside the valve body, and a second side portion differential pressure valve allowing a fluid to flow only in a direction from the second outlet to the second inlet/outlet in response to a differential pressure between the second outlet and the second inlet/outlet is disposed between the second outlet and the second inlet/outlet inside the valve body so that a fluid pressure acting on the main valve body becomes the same in a flow of both directions including one direction from the first inlet/outlet to the second inlet/outlet through the main valve chamber and the other direction from the second inlet/outlet to the first inlet/outlet through the main valve chamber, wherein valve bodies of the first and second bottom portion differential pressure valves (70; 80) are moved in the same direction as the movement direction of the main valve body and valve bodies of the first and second side portion differential pressure valves (50; 60) are moved in a direction orthogonal to the movement direction of the main valve body. a valve body which is provided with a main valve chamber and first and second inlet/outlets (11; 12) and in which an inlet is opened to a bottom portion of the main valve chamber and first and second outlets (13a; 13b) are opened to a side portion of the main valve chamber; a main valve body which is disposed in the main valve chamber to be elevatable relative to the inlet in order to control a flow rate of a fluid flowing in the inlet; and an elevation drive source which elevates the main valve body relative to the inlet, wherein a first bottom portion differential pressure valve allowing a fluid to flow only in a direction from the first inlet/outlet to the inlet in response to a differential pressure between the first inlet/outlet and the inlet is disposed between the first inlet/outlet and the inlet inside the valve body, a second bottom portion differential pressure valve allowing a fluid to flow only in a direction from the second inlet/outlet to the inlet in response to a differential pressure between the second inlet/outlet and the inlet is disposed between the second inlet/outlet and the inlet inside the valve body, a first side portion differential pressure valve allowing a fluid to flow only in a direction from the first outlet to the first inlet/outlet in response to a differential pressure between the first outlet and the first inlet/outlet is disposed between the first outlet and the first inlet/outlet inside the valve body, and a second side portion differential pressure valve allowing a fluid to flow only in a direction from the second outlet to the second inlet/outlet in response to a differential pressure between the second outlet and the second inlet/outlet is disposed between the second outlet and the second inlet/outlet inside the valve body so that a fluid pressure acting on the main valve body becomes the same in a flow of both directions including one direction from the first inlet/outlet to the second inlet/outlet through the main valve chamber and the other direction from the second inlet/outlet to the first inlet/outlet through the main valve chamber, wherein valve bodies of the first and second bottom portion differential pressure valves (70; 80) are moved in the same direction as the movement direction of the main valve body and valve bodies of the first and second side portion differential pressure valves (50; 60) are moved in a direction orthogonal to the movement direction of the main valve body.