An image forming apparatus comprising: an image supporter that supports an image to be transferred to paper; a transfer belt that is opposed to the image supporter and forms a nip (NP); a first heater and a second heater arranged to heat the transfer belt ; a temperature detecting means that is capable of detecting a vicinity temperature of the transfer belt ; and a control means that controls actuation of the first heater and the second heater , wherein the first heater has higher performance to uniformly heat an entire area of the transfer belt than the second heater , and the second heater is capable of more rapidly heating the transfer belt to change the temperature of the transfer belt than the first heater , and the control means is configured to independently control the actuation of the first heater and the second heater such that the vicinity temperature of the transfer belt is within a temperature range between a first threshold value (T1) and a second threshold value (T2) having a smaller value than the first threshold value (T1), and wherein the control means is further configured to control the first heater and the second heater, while a power source of the image forming apparatus is on , such that: in a case where the vicinity temperature of the transfer belt is lower than the second threshold value (T2), the first heater and the second heater are actuated, and the first heater has a fixed heat output; in a case where the vicinity temperature is equal to or higher than the second threshold value (T2) and equal to or lower than the first threshold value (T1), only the first heater is actuated; and the first heater has a fixed heat output; and, in a case where the vicinity temperature is higher than the first threshold value (T1), both of the first heater and the second heater are not actuated. an image supporter that supports an image to be transferred to paper; a transfer belt that is opposed to the image supporter and forms a nip (NP); a first heater and a second heater arranged to heat the transfer belt ; a temperature detecting means that is capable of detecting a vicinity temperature of the transfer belt ; and a control means that controls actuation of the first heater and the second heater , wherein the first heater has higher performance to uniformly heat an entire area of the transfer belt than the second heater , and the second heater is capable of more rapidly heating the transfer belt to change the temperature of the transfer belt than the first heater , and the control means is configured to independently control the actuation of the first heater and the second heater such that the vicinity temperature of the transfer belt is within a temperature range between a first threshold value (T1) and a second threshold value (T2) having a smaller value than the first threshold value (T1), and wherein the control means is further configured to control the first heater and the second heater, while a power source of the image forming apparatus is on , such that: in a case where the vicinity temperature of the transfer belt is lower than the second threshold value (T2), the first heater and the second heater are actuated, and the first heater has a fixed heat output; in a case where the vicinity temperature is equal to or higher than the second threshold value (T2) and equal to or lower than the first threshold value (T1), only the first heater is actuated; and the first heater has a fixed heat output; and, in a case where the vicinity temperature is higher than the first threshold value (T1), both of the first heater and the second heater are not actuated. <EOS>