Abstract: An improved pitched rigid frame structure in which an inside space is made lager than previous ones. The pitched rigid frame structure includes a pair of posts; diagonal beams extending from a post top of each post and joining to configure a pitched roof; an angle brace built between a point on a post and a point on a diagonal beam, the point on the post descending from a crossing point of the post and an axis line of the diagonal beam, the point on the diagonal beam heading from each post top to an apex of the pitched roof, and an inclined tension member built between a lower end of a compression member hanging from the apex of the pitched roof and the point on the diagonal beams building the angle brace.