An object of the present invention is to provide an assembly tent that is easy to assemble, excellent in strength, and capable of being disassembled and compactly accommodated after use. The assembly tent is a tent assembled through coupling of a traverse beam member extending horizontally from two adjacent supporting columns at both ends of a coupling member, wherein coupling between the traverse beam member and the coupling member is formed by inserting, into one member of the traverse beam member and the coupling member, the other member in an axial direction. For establishing the coupling between the traverse beam member and the coupling member, a pin insertion hole is provided to a circumference side wall of the one member of the traverse beam member and the coupling member, a lock mechanism, which biases a lock pin to penetrate the pin insertion hole from an outer circumference side wall and protrude from an inner circumference side wall, is arranged at the outer circumference side wall, and a pin engagement concave portion is arranged at an outer circumference side wall of the other member, such that when the other member is inserted into the one member, the biased lock pin engages with the pin engagement concave portion to lock the coupling between the traverse beam member and the coupling member.