A rice cooker — an appliance that automatically cooks rice; many models also have keep-warm and specialized cooking settings.
新しい炊飯器を買ってから、ご飯がおいしくなった。
Since buying a new rice cooker, the rice has become tastier.
毎朝、炊飯器でまとめてご飯を炊く。
Every morning I cook rice in bulk with the rice cooker.
この炊飯器は炊き込みご飯モードがある。
This rice cooker has a takikomi-gohan (mixed rice) mode.