To provide a baking method for an electrodeposition coating film by which the hardening of a coating film in the whole part can sufficiently be performed without delaying a coating process.

The baking method for an electrodeposition coating film includes a stage where an electrodeposition coated material whose surface is provided with a coating film of an electrodeposition coating material is provided; a stage where a plurality of thermosheet pieces are pasted on the surface of the electrodeposition coated material; a stage where the electrodeposition coated material is charged to a temperature-controlled heating furnace; and a stage where the electrodeposition coated material is heated for a time till the difference between the highest temperature and the lowest temperature shown by the thermosheet pieces reaches 30°C or less.