To attach a fuel injection valve to a fuel distributing member so as to keep its good sealing condition for a long time.

A seal surface 13 tapered in shape is formed in the inner peripheral surface of the branch hole 12 of a fuel distributing member 10. A contact surface 23 including a part of a spherical surface is formed in the upper end part of the inserting part 21 of a fuel injection valve 20. A screw member 30 is fitted around the inserting part 21 so as to be rotated. This screw member 30 is engaged with the branch hole 12 and the contact surface 23 is pressed to the seal surface 13 and thereby the fuel injection valve 20 is attached to the branch hole 12 of the fuel distributing member 10 so as to keep its good sealing condition.