To provide a steel pipe with a gusset plate, the working cost of which is reduced, for which a skilled worker is made unnecessary and by which quality is improved.

The steel pipe 1 with the gusset plates has the gusset plates 3 integrally worked in the case of the molding of the steel pipe body 2 in parts in the longitudinal direction of the steel pipe body 2. When the steel pipe body 2 is the round worked product of the steel plate, the gusset plates 3 may be projected from the edge section of the steel plate and bent at base ends.