The composite deck which consists of bottom steel plates with channels and RC slab(LWC deck in abbreviation, see Fig. 1) is proposed by the authors. Consequently, the welded channel inside hollow section of LWC-deck lead to reducing of its self weight. LWC deck to be lighter than ordinary steel concrete composite deck may also reduce seismic action on substructures such as a pier. Therefore, it is very significant to investigate mechanical behavior of the welded channel under direct shear for the practical application. In this study, we carried out push out test on five specimens of channel shear connector. The purpose of present study is to investigate shear bond characteristics of the channel shear connector through a push out testing method. Testing parameter considered is its web height-to-thickness ratio, t₁/ B. As a result, shearing capacities of the channel shear connector held a good deformability in comparison with headed stud shear connector. Those direct shearing capacities were meaningfully affected by above described parameter, t₁/ B. Observed failure modes were both compressive failure of concrete under the channel's flange and buckling of its web. Furthermore, empirically estimated method of the channel shear connector's strength to be based on web height-to-thickness ratio was also discussed.