A liquid ejecting apparatus includes a heating unit; a detecting unit capable of detecting the energies of plural detection areas in a heating area to be heated by the heating unit; and a controller that controls the heating unit on the basis of the energies of the plural detection areas detected by the detecting unit. The controller controls the number of detection areas which are used in control of the heating unit in a case where a medium has been transported to a position where the medium overlaps with at least one of the plural detection areas so that the number is larger than the number of detection areas which are used in the control of the heating unit in a case where a medium has been transported to a position where the medium does not overlap with at least one of the plural detection areas.