PURPOSE: To prevent an ill effect by distortion caused in the center part without requiring the combined use of a strut even in the case of plurally connecting molded timbering beams for use as well as the case of using them as a sole body, and optimize the utilization of timbering in the construction of a large-size and heavy concrete structure such as a reinforced concrete bridge beam.

CONSTITUTION: A molded timbering beam is formed of a beam body 10 formed in a truss beam form by providing a joint member 13 and a diagonal member 14 continuously to a lower side member 11 and an upper side member 12, and the beam body 10 has lower end side connecting parts 10a, 10b on both axial ends of the lower side member 11 and upper end side connecting parts 10c, 10d on both axial ends of the upper side member 12. One lower end side connecting part 10 and the other lower end side connecting part 10b are set in such a manner that they are mutually conformed, and mutually connected rotatably in vertical direction by the insertion of a connecting pin 20. One upper end side connecting part 10c and the other upper end side connecting part 10d are set in such a manner that they are mutually connected under the interposition of spacers 30 having different length dimensions.