Fluid pressure regulation apparatus and fuel supply apparatus

A fluid pressure regulation apparatus comprising:

• a housing formed to have a fluid introduction opening through which fluid is introduced, and a fluid discharge opening through which the fluid is discharged, and in the housing formed a pressure adjustment chamber which is held in communication with the fluid introduction opening, and
• a pressure adjustment member in the form of a partition wall and capable of communicating the fluid introduction opening with the fluid discharge opening in response to the fluid pressure in the pressure adjustment chamber, the fluid pressure in the pressure adjustment chamber being adjustable to a preliminarily set pressure,
• the pressure adjustment member forming an area of a pressure receiving range receiving the fluid pressure in the pressure adjustment chamber at one surface side thereof, the area being variably set, and the set pressure being varied in response to the area of the pressure receiving range.