To provide an electric rice cooker where the thermal insulating performance of a lid unit has been improved sufficiently by forming a widest possible part of the lid unit of a vacuum thermal insulating structure.

This electric rice cooker is equipped with a rice cooker body 1 where a rice cooker 2 is stored, a lid unit 10 covering the top of the cooker body 1, and a radiation plate 10c provided inside the lid unit 10. With the exception of the steam discharge passage portion of the lid unit 10, the part opposite to the radiation plate 10c is formed of a vacuum heat insulating structure 10b, and a heat insulating space is formed between the first radiation plate 10b and the radiation plate 10c.