PURPOSE: To easily construct a ceiling frame and to facilitate operations subsequent to construction work without causing variation of strength and dimensional precision.

CONSTITUTION: A rectangular frame body 10 is formed by steel 11, 14, and the steel 11 on the two opposite sides of the frame body 10 is channel steel 11 having inward channeled portions 12 arranged opposite each other therein. A plurality of slide steel members 13 are fitted between the channeled portions 12 of the channel steel 11 to orthogonally intersect the channel steel 11, and each slide steel member 13 can be slid toward the channels of the channel steel 11.