A heating apparatus comprising: a heater; a switching circuit configured to switch on/off current-feeding from an AC power source to the heater; a temperature detector configured to detect a temperature of the heater; and a current-feed controller configured to execute a first current-feed mode of changing a current-feed ratio of current-feeding time to unit time by controlling switching of the switching circuit so that the temperature detected by the temperature detector falls within a target range, wherein the current-feed controller executes a second current-feed mode of fixing the current-feed ratio to a ratio of 98% to 100% or a ratio of 0% to 2% in place of the first current-feed mode, and in the second current-feed mode, the current-feed controller extends the fixed period in which the current-feed ratio is fixed in accordance with an increasing power consumption of the heater, characterized in that in case of executing the second current-feed mode of fixing the current-feed ratio to a ratio of 98% to 100%, before execution of the first current-feed mode after execution of the second current-feed mode, the current-feed controller executes a third current-feed mode of controlling the switching circuit at a current-feed ratio that is smaller than the current-feed ratio in the first current-feed mode, or in case of executing the second current-feed mode of fixing the current-feed ratio to a ratio of 0% to 2%, before execution of the first current-feed mode after execution of the second current-feed mode, the current-feed controller executes a fourth current-feed mode of controlling the switching circuit at a current-feed ratio that is larger than the current-feed ratio in the first current-feed mode. a heater; a switching circuit configured to switch on/off current-feeding from an AC power source to the heater; a temperature detector configured to detect a temperature of the heater; and a current-feed controller configured to execute a first current-feed mode of changing a current-feed ratio of current-feeding time to unit time by controlling switching of the switching circuit so that the temperature detected by the temperature detector falls within a target range, wherein the current-feed controller executes a second current-feed mode of fixing the current-feed ratio to a ratio of 98% to 100% or a ratio of 0% to 2% in place of the first current-feed mode, and in the second current-feed mode, the current-feed controller extends the fixed period in which the current-feed ratio is fixed in accordance with an increasing power consumption of the heater, characterized in that in case of executing the second current-feed mode of fixing the current-feed ratio to a ratio of 98% to 100%, before execution of the first current-feed mode after execution of the second current-feed mode, the current-feed controller executes a third current-feed mode of controlling the switching circuit at a current-feed ratio that is smaller than the current-feed ratio in the first current-feed mode, or in case of executing the second current-feed mode of fixing the current-feed ratio to a ratio of 0% to 2%, before execution of the first current-feed mode after execution of the second current-feed mode, the current-feed controller executes a fourth current-feed mode of controlling the switching circuit at a current-feed ratio that is larger than the current-feed ratio in the first current-feed mode.