To provide a composite construction plate capable of enhancing workability at a job site and the efficiency of carrying, by reducing weight by a combination of a steel plate and a synthetic resin skeleton member.

This composite construction plate is provided by substantially closely incorporating a synthetic resin block into a steel plate box-shaped frame body 20, and characterized in that the block is composed of the synthetic resin skeleton member 6 partitioned into a large number of divisions by a partition wall, and the skeleton member and a steel plate covering plate 7 covering the opening surface side of the skeleton member are engaged by recess-projection engagement, and fixed in a steel plate frame.