A Heating Cooker

A heating cooker is provided to allow a door to be automatically opened while a support operation of a door support is being released through a one-touch operation when a user puts foods into a cooking chamber or takes the foods out of the cooking chamber. A heating cooker comprises a body(1) having a cooking chamber(3). A door(11) rotates in the body such that the cooking chamber is opened and closed. A door support(17) is provided at the body to support the door such that a sealing state of the cooking chamber is maintained. A hinge section(13) connects the door with the body, and guides angular motion of the door such that the door is automatically opened when a door support state of the door support is released. The door support includes a locking hook and a driving motor for moving the locking hook. A locking groove is formed in the door for locking with the locking groove.