Flow control restrictor

A flow control restrictor, comprising:

• a needle valve which is inserted into a regulation hole formed in a fuel regulating device;
• and
• a limit cap which is made of metal and attached to the needle valve, wherein
• in the needle valve,
• a first shaft portion which is made of metal and screwed into a first hole portion formed on an inner side of the regulation hole, and
• a second shaft portion which is made of metal and housed inside a second hole portion formed on an outer side of the regulation hole are formed,
• a first projection-and-recess portion is formed on an outer peripheral surface of the second shaft portion,
• a pressed portion which is made of resin is provided on the first shaft portion side relative to the first projection-and-recess portion on the outer peripheral surface of the second shaft portion,
• the limit cap is fitted onto the second shaft portion,
• a projecting portion which is inserted into a restriction groove for rotation restriction which is formed in an inner peripheral surface of the second hole portion is formed on an outer peripheral surface of the limit cap,
• a second projection-and-recess portion which is engaged with the first projection-and-recess portion in a circumferential direction of the limit cap is formed on an inner peripheral surface of the limit cap,
• the pressed portion of the needle valve is pressed against the inner peripheral surface of the limit cap,
• the pressed portion of the needle valve is pressed against the second projection-and-recess portion of the limit cap,
• the second projection-and-recess portion is a portion in which a plurality of linear projections extending in the axial direction of the limit cap are arranged in the circumferential direction of the limit cap, and
• each projection of the second projection-and-recess portion bites into the outer peripheral surface of the pressed portion.