Amplification device

An amplification device configured to switch between a first amplifying function that allows sound volume adjustment and a second amplifying function that does not allow sound volume adjustment, the amplification device comprising:

• an operating member that receives setting of a sound volume, the operating member having a state changed according to the sound volume;
• a signal processing circuit that amplifies an incoming sound signal so that the sound volume set by the operating member is obtained;
• and
• a controller that controls the signal processing circuit, wherein
• during execution of the first amplifier function, the controller controls an amplifying operation of the signal processing circuit so that the sound volume set by the operating member can be obtained, and wherein
• when the first amplifier function is switched to the second amplifier function and then the second amplifier function is switched to the first amplifier function and at this time the state of the operating member is the state corresponding to a second sound volume larger than a first sound volume that was output right before switching from the first amplifier function to the second amplifier function, the controller changes the state of the operating member to a state corresponding to a third sound volume smaller than the second sound volume, and controls the amplifying operation of the signal processing circuit to cause the signal processing circuit to output the third sound volume.