A detection device detects a dynamic quantity exerted on a detection mechanical system including first and second mechanical oscillators. The detection device includes first to third transducers, a canceller, a low-pass filter, and an inverting amplification unit. The first transducer detects the first mechanical oscillator position in a first direction to output a first signal. The second transducer detects the second mechanical oscillator position in a second direction to output a second signal. The canceller inverts a direction in which a signal detected by the second transducer from the second mechanical oscillator varies according to the first signal. The third transducer detects the second mechanical oscillator position in the second direction to output a third signal. The inverting amplification unit gives a control signal generated by inverting the third signal to a second actuator moving the second mechanical oscillator.