To provide a water level detection mechanism capable of accurately detecting an accurate arrangement of a water tank and a water level of the water tank with a simple and safe configuration, a steam generator and a heating cooker.

A water level detection 5 includes a first electrode 51 attached to a case 1, a second electrode 52 attached to the case 1 in a state of being insulated from the first electrode 51, and a third electrode 53 insulated from the first electrode 51, and electrically connected to the second electrode 52 and attached to a water tank 2 so as not to be brought into contact with water in the water tank 2 when the water tank 2 is mounted on the case 1.