1. A device for compensating fluctuation in the amount of transfer of ink to a printing medium in a thermal transfer type printer which is supplied with transfer signals each of said transfer signals being indicative of a particular assigned transfer order of said signals in response to a video signal representive of an image to thermally and sequentially transfer particular kinds of thermally fusible ink which are each associated with said assigned transfer order one upon another on a printing medium, said device comprising: transfer signal input means to which a plurality of transfer signals are supplied; and transfer signal compensation means for outputting one of the transfer signals indicative of one of a first and a last transfer directly as a transfer signal of said one of said first and last transfer of said assigned transfer order, while outputting all other of said transfer signals as transfer signals of the orders assigned respectively to said other transfer signals after subjecting each of said other transfer signals to compensation which is representative of said particular assigned order of said transfer signals.