Provided is a living body stimulation device capable of suppressing distortion in the waveform of a pseudo-sine wave. In a stimulation signal, a positive pulse group, which includes a plurality of pulses whose potential rises toward the plus-side, and a negative pulse group, which includes a plurality of pulses whose potential falls toward the minus-side, appear alternately at predetermined intervals. When a single period of the stimulation signal is divided into four terms consisting of first, second, third, and fourth terms: the positive pulse group appears in the first term and the second term, wherein, in the first term, the pulse width gradually widens, and in the second term, the pulse width gradually narrows in a manner that change-over-time thereof is reverse of the change-over-time of the pulse width in the first term； and the negative pulse group appears in the third term and the fourth term, wherein, in the third term, the pulse width gradually widens, and in the fourth term, the pulse width gradually narrows in a manner that change-over-time thereof is reverse of the change-over-time of the pulse width in the third term. The stimulation signal includes: a discharge pulse that is provided immediately before the positive pulse group and whose potential rises toward the plus-side； and a discharge pulse that is provided immediately before the negative pulse group and whose potential falls toward the minus-side.
