The present invention relates to a tidal current power generator. In the tidal current power generator, tidal current flows in a concentrated manner into a power generation module for generating electrical energy using the flow of tidal current, in order to increase the speed of the tidal current. Thus, the amount of electrical energy generated by the power generation module may be improved to achieve highly efficient performance. Also, the range of locations in which the power generation module may be installed is significantly expanded in order to increase the electrical generation using tidal current. Since the power generation module is integrally assembled and then refloated in order to install same on the bottom of the sea, the power generation module may be easily installed as well as easily repaired and maintained.