To provide a panel connecting device which enhances connection workability without restrictions on the flexibility of the layout of a panel.

A pair of locking portions 3 and 3 of a fastening body A is engaged with the backside of a protrusion 13 which is provided in the opening of an engaging groove 14. Subsequently, a fastening screw C is fastened by being screwed into the screw hole 2 of the fastening body A via an insertion hole 6 of a connecting body B. Thus, a panel abutting surface 9 of the connecting body B abuts on each of respective surfaces of the pair of partition panels P and P, and the protrusion 13 of the engaging groove 14 of the each partition panel P is held in the state of being sandwiched and pressed by the locking portion 3 of the fastening body A and the panel abutting surfaces 7 and 9, so that the pair of partition panels P and P can be connected together.