Fuel injection valve mount structure

In a fuel injection valve attaching structure in an intermediate portion of a fuel injector (I) a first contact surface (5) which is orthogonal to the central axis (A) of the fuel injector (I) and a fuel supply sleeve (Da) is opposite, and paired second contact surfaces (6, 6) with an intermediate plane (C) containing the central axis (a) and a center line (B) of a clutch (14), opposed to each other, is formed. A support member (S) includes: a base plate (15) sits on the first contact surface (5); an elastic piece (16) extending from the base plate (15) to (Da) to come in elastic pressure contact and its reaction force, the fuel injection valve (I) to an injection valve mounting hole (10) to bias the fuel supply sleeve towards; and paired rotational stop pieces (17, 17), each of the base plate (15) extending to each said second contact surfaces (6, 6) support and rotation of the fuel injector (I) around the central axis to limit around (A). This can be limited around easily the rotation of the fuel injector (I) about its central axis (A).