To prevent occurrence of an unspecified number of linear scratches on a non-adhesive heat-resistant film caused by a nearly doughnut-like flat surface part of a rotating table hitting against the bottom part of a rotative mounting base in mounting the rotative mounting base on the rotating table.

This high-frequency heating device is so structured that a member provided with a heat-resistant film 16 is used on the rotating table 9, the device has a fitting part 12 fitted to the inside of a ridge of the rotative mounting base 8, the fitting part 12 is provided with the nearly doughnut-like flat surface part 13 and three or more hemispherical projections 17 are formed on the flat surface part 13. Accordingly, the occurrence of the unspecified number of linear scratches due to vibration in a manufacturing process of the high- frequency heating device or in mounting the mounting base 8 on the rotating table 9 for cooking food can be prevented.