To surely execute positioning of three heads in a simple structure and prevent the shifting of colors even in the case where three colors are printed in parallel by providing the three heads.

A head positioning mechanism 34A-34C, 51A-51C that determines a position of a head by referring to a platen roller provided to a position opposite to the head when the head is put down, is provided to each of three heads. Thereby, it is possible to surely execute the positioning of the three heads in a simple structure and to prevent the shifting of colors. It is possible thereby to achieve a printer capable of surely executing the positioning of the three heads in a simple structure and of preventing the shifting of the colors even when the three colors are printed in parallel by providing the three heads.