To provide a control valve for a variable displacement compressor using a
diaphragm for a pressure-sensing section, which is capable of sensing
suction pressure as absolute pressure. A core, a first plunger, and a
spring of a solenoid are accommodated in a bottomed sleeve. A diaphragm
is welded to an open end of the bottomed sleeve under vacuum atmosphere,
whereby an assembly having a vacuum inside is formed. As a result,
suction pressure Ps can be sensed as an absolute pressure with reference
to a vacuum. The magnetic gap between the first plunger and the core is
adjusted by the amount of press-fitting of the core into the bottomed
sleeve, and the adjustment of load of the spring incorporated into the
bottomed sleeve is made by deforming the bottom of the bottomed sleeve
such that it is dented inward.