A flasher type fish sonar includes a front case with a transparent display window, a signal transmitting element at a center thereof, a connecting base board having a first timing detecting portion mounted thereto, a signal receiving element mounted opposite the signal transmitting element, a receiving coil mounted at a periphery of the signal receiving element, a display LED attached opposite the display window, a display rotary disc having a second timing detecting portion mounted opposite the first timing detecting portion and near the display LED, an electric power transmitting coil mounted to the connecting base board opposite the receiving coil, a main base board fixed to the connecting base board and a motor on the main base board for rotating the display rotary disc, such that a a water surface, reflected echos of fishes and a water bottom of the sea are displayed in the display window.
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