PURPOSE: To provide a carburetor control device which lets an engine exhibits the performance in response to various engine speed of the engine.

CONSTITUTION: A pulse generating circuit 61 generates pulse current having a commanded duty ratio and a drive frequency, and a duty solenoid 1 intermittently supplies air to a carburetor 3 in response to the ON/OFF state of the pulse current. A drive frequency judging part 63 commands a first frequency to the pulse generating circuit 61 as the drive frequency when the present engine speed is under a prescribed speed N1, it commands a second frequency to the pulse generating circuit 61 as the drive frequency when the present engine speed is over a prescribed speed N2, and when the present engine speed is over the speed N1 and under the speed N2, it commands the latest drive frequency commanded in the past to the pulse generating circuit 61. A duty ratio computing part 62 commands a duty ratio corresponding to this drive frequency and the present engine speed to the pulse generating circuit 61.