To provide a rafter of a roof of a terrace or the like having a retaining member fitting part of a roof panel and a roof panel support flange having a large strength, which rafter can be formed slim and have an increased installation pitch (span).

A screw insertion hole 15 of a rafter base material 11 in the longitudinally long rectangular hollow rafter wood 16 having a loading member fitting part 17 for the roof panel and the roof panel support flange 18 for the roof panel is inserted into the vertical groove 12 of the rafter base material 11 with a longitudinally long rectangular groove shape with the screw insertion hole 15 formed of a pair of upper and lower flanges 14 at both ends of the upper end at the forwardly declining state that the roof panel support flange 18 projects outwards of the rafter base material 11 and fixed through a drilling tapping screw 19 to the hollow inside of the rafter wood 16 through the screw insertion hole 15 of the rafter base material 11.