A solenoid proportional control valve that is capable of controlling a large flow rate and easy to manufacture is provided. The proportional solenoid valve comprises a main orifice 4 that is formed between an inlet portion 1 and an outlet portion 2 of the valve, such that a main valve head 5f, which is partially supported by the bellows 5a, is abutted against the main orifice 4, so as to be capable of adjusting a degree of opening of the main orifice 4a. An interior of the bellows communicates with the fluid outlet portion 2 of the valve. An accommodating chamber 6b is provided outside the bellows 5a, such that the accommodating chamber 6b and the inlet portion 1 of the valve are communicated by a first fixed orifice 6a. Further, the accommodating chamber 6b is provided with a secondary orifice 5e that communicates with the outlet portion 2 of the valve. A valve head 7a is disposed in the vicinity of the secondary orifice 5e, so as to be capable of adjusting the degree of opening of the secondary orifice 5e by means of the solenoid.