PURPOSE: To obtain the reference voltage generating circuit capable of generating a multistage or multikind reference voltage in simple adjustment and yet changing continuously and smoothly an acceleration and deceleration part.

CONSTITUTION: An output voltage of a voltage source 2 is attenuated with an attenuation amt. set in a D/A converter circuit 6 by a voltage variable means 3. A reference voltage is formed by a reference voltage forming circuit 4 in charging and discharging an output voltage of the voltage variable means 3. A charging/discharging speed of the reference voltage forming circuit 4 is set with a variable rate set in a D/A converter circuit 21 by a variable rate setting means 5.