The present invention relates to a charge transfer device for multiplexing signals and eliminates an output circuit and level adjusting circuit necessary for multiplexing signals in the prior art. There are provided at least two first and second transfer channels (34) and (35) for transferring signal charges and a third transfer channel (36) for alternately multiplexing the signal charges which are transferred within the transfer channels (34) and (35). To the first and second transfer channels (34) and (35) is supplied the same transfer clock signal and to the third transfer channel is supplied a second transfer clock signal with a frequency of which is n times the transfer channels before the signals are multiplexed. a multiphase clock with different phases of the clock being applied to spatially corresponding electrodes is used in the invention. The present invention can be used as a signal multiplexing charge transfer device for a color solid state image sensor which uses an image sensing element such as CCD.