An image forming apparatus includes a first sensor configured to detect a temperature; an image forming unit configured to form an image; a sheet container configured to contain sheets; a conveyance roller configured to convey a sheet from the sheet container; a transfer unit configured to transfer the image on the sheet conveyed by the conveyance roller; a fixing unit configured to fix the image on the sheet by heating the image on the sheet; a second sensor configured to detect a temperature of the fixing unit; a sheet container heater configured to heat the sheet in the sheet container, wherein the sheet container heater is provided at a position where a distance from the first sensor to the sheet container heater is closer than a distance from the fixing unit to the sheet container heater.