An image projection apparatus that projects an image using light from a light source , comprising: the light source ; a temperature detector (S2) configured to detect a temperature inside of the apparatus; and a controller configured to perform a protection operation when the temperature detected by the temperature detector is higher than a predetermined temperature, the controller having stored a first predetermined temperature (A) and a second predetermined temperature (B), wherein the first predetermined temperature (A) is higher than the second predetermined temperature (B), and wherein the controller is further configured to acquire a power-on elapsed time representing an elapsed time from when an operation of a power switch for turning on the light source is performed, and to determine whether the power-on elapsed time has reached a second predetermined time (T2) or not, the image projector being characterized in that : in case where the power-on elapsed time has not reached the second predetermined time (T2), the controller is further configured to acquire a power-off elapsed time from when a previous operation of the power switch for turning off the light source is performed to when a current operation of the power switch for turning on the light source is performed, to determine whether the power-off elapsed time has reached a first predetermined time (T1), and to set the first predetermined temperature (A) as the predetermined temperature in case where the first predetermined time (T1) is not reached, and to set the second predetermined temperature (B) as the predetermined temperature in case the first predetermined time (T1) is reached. the light source ; a temperature detector (S2) configured to detect a temperature inside of the apparatus; and a controller configured to perform a protection operation when the temperature detected by the temperature detector is higher than a predetermined temperature, the controller having stored a first predetermined temperature (A) and a second predetermined temperature (B), wherein the first predetermined temperature (A) is higher than the second predetermined temperature (B), and wherein the controller is further configured to acquire a power-on elapsed time representing an elapsed time from when an operation of a power switch for turning on the light source is performed, and to determine whether the power-on elapsed time has reached a second predetermined time (T2) or not, the image projector being characterized in that : in case where the power-on elapsed time has not reached the second predetermined time (T2), the controller is further configured to acquire a power-off elapsed time from when a previous operation of the power switch for turning off the light source is performed to when a current operation of the power switch for turning on the light source is performed, to determine whether the power-off elapsed time has reached a first predetermined time (T1), and to set the first predetermined temperature (A) as the predetermined temperature in case where the first predetermined time (T1) is not reached, and to set the second predetermined temperature (B) as the predetermined temperature in case the first predetermined time (T1) is reached. <EOS>