To provide a hot plate for retaining a uniform temperature on a plane surface, a dryer using the hot plate, and a vacuum dryer.

The hot plate has a plurality of heating elements 13 on a metal plate 11 with comparatively superior thermal conductivity and temperature sensors 14 closer to the heating elements and having a number equal to that of the heating elements 13, and a temperature control circuit for controlling a calorific value of the heating element 13 by comparing the temperature to be set up by the plate temperature information of the temperature sensor 14 is arranged on each heating element 13 in order to set up the surface temperature of the hot plate at desired temperature. A power transistor is used as a heating element 13, and such the heating elements 13 are arranged at a lattice shape.