Provided are a toilet seat device saving energy and accurately stabilizing the temperature of a seating section at a predetermined level in a short time, and a toilet apparatus having the same. A control section adjusts the temperature of a toilet seat section to 18° C. when a heating function is turned on, and during a standby period D1, the control section performs low electric power drive of a lamp heater provided at the toilet seat section. The control section starts 600 W drive of the lamp heater at time t1 after the control section detects user's entry into a room, and the control section maintains the 600 W drive during an inrush current reduction period D2. The control section starts 1200 W drive of the lamp heater at time t2 and maintains the 1200 W drive during a first temperature rise period D3. After the temperature of the seating section reaches limit temperature, the control section starts 600 W drive of the lamp heater at time t3 and maintains the 600 W drive during a second temperature rise period D4. After the temperature of the seating section reaches a temperature higher than a toilet seat set temperature, the control section starts low electric power drive of the lamp heater at time t4.