The invention provides a beam detection device and a printing device in which an absolute value of a first voltage signal (V1) from a first amplifier (31) and a second voltage signal from a second amplifier (32) When at least one of the absolute values â€‹â€‹of (V2) exceeds the absolute value of the threshold voltage (-Vth), the startup circuit (34) outputs the first control signal (Se1) to the output circuit (35), thereby setting the output circuit (35) to Action state. On the other hand, when the absolute value of both the first output voltage (V) and the second output voltage (V2) is less than or equal to the absolute value of the threshold voltage (-Vth), the startup circuit (34) corresponds to the output circuit (35) The second control signal (Se2) is output so that the output circuit (35) is set to a non-operating state. This light beam detection device can prevent an error from occurring at the detection timing of the light beam due to the change in the light quantity of the light beam, and can prevent erroneous detection caused by the reflected light.
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