To safely and surely cook raw eggs to be boiled eggs 10 by using the excess steam or rice cooking jetted from a blow-out port 9 of rice cooking steam opening 9 at the top surface 8' of a rice cooker, etc.

An opening part at the upper end of an egg housing container 1 is operable and closable with a sealing lid 2, a bottom plate 3 has a team inputting port 4, the plate 3 has downward suckers 5, a porous egg receiver 6 supported through a gap (t) on the plate 3 is provided, and steam discharging small holes 7 are bored at the lower part of the container 1.