A variable load valve comprising: a valve body having a space defined therein; an annular-shaped first diaphragm member disposed within said space in a state in which an outer peripheral portion thereof is fixed, to define, in said space, a pilot chamber for receiving an air pressure according to a vehicle weight, the first diaphragm member being bendable by a pressure inside the pilot chamber; an annular-shaped second diaphragm member disposed within said space in a state in which an outer peripheral portion thereof is fixed, to define, in said space, an output chamber for outputting a load compensated pressure, the second diaphragm member being bendable by a pressure inside the output chamber; a piston adapted to be axially displaced in accordance with a bending of the first diaphragm member and a bending of the second diaphragm member, thereby generating a load compensated pressure; characterized in that a force transmitting member having a fixed portion fixed to an outer peripheral surface of the piston, a pressure receiving portion having a pressure receiving surface extended radially from the fixed portion for receiving a pressing force caused by the bending of the second diaphragm member, and an extension portion extended radially from the fixed portion at a position opposite to the pressure receiving portion across the second diaphragm member, the force transmitting member being adapted to transmit, to the piston, a force according to the pressing force received from the second diaphragm member through the pressure receiving surface; and a diaphragm fixing member formed separately from the valve body, and adapted to fix the outer peripheral portion of the second diaphragm member to the valve body and set an area of the pressure receiving surface of the force transmitting member. a valve body having a space defined therein; an annular-shaped first diaphragm member disposed within said space in a state in which an outer peripheral portion thereof is fixed, to define, in said space, a pilot chamber for receiving an air pressure according to a vehicle weight, the first diaphragm member being bendable by a pressure inside the pilot chamber; an annular-shaped second diaphragm member disposed within said space in a state in which an outer peripheral portion thereof is fixed, to define, in said space, an output chamber for outputting a load compensated pressure, the second diaphragm member being bendable by a pressure inside the output chamber; a piston adapted to be axially displaced in accordance with a bending of the first diaphragm member and a bending of the second diaphragm member, thereby generating a load compensated pressure; characterized in that a force transmitting member having a fixed portion fixed to an outer peripheral surface of the piston, a pressure receiving portion having a pressure receiving surface extended radially from the fixed portion for receiving a pressing force caused by the bending of the second diaphragm member, and an extension portion extended radially from the fixed portion at a position opposite to the pressure receiving portion across the second diaphragm member, the force transmitting member being adapted to transmit, to the piston, a force according to the pressing force received from the second diaphragm member through the pressure receiving surface; and a diaphragm fixing member formed separately from the valve body, and adapted to fix the outer peripheral portion of the second diaphragm member to the valve body and set an area of the pressure receiving surface of the force transmitting member.