Pressure detecting appartus

A pressure detecting apparatus for detecting differential pressure between two fluid chambers into which fluids are imported respectively, said apparatus comprising:

• a housing for forming said two fluid chambers;
• a pressure-receiving member provided slidably in said housing so that said pressure-receiving member moves from one of said fluid chambers to the other of said fluid chambers in accordance with differential pressure between said two fluid chambers;
• an elastic member supported by said housing and engaged with said pressure-receiving member so as to be elastically deformed due to a slide displacement, of said pressure-receiving member, from a predetermined position;
• a displacement detecting system which detects said displacement of said pressure-receiving member, from said predetermined position;
• and
• said elastic member including a base portion supported by said housing, an engagement portion engaged with said pressure-receiving member, and at least one flexible arm extending from said base portion toward said engagement portion along a plane approximately perpendicular to a direction of sliding of said pressure-receiving member.