An electrical stimulation treatment device includes a pair of application electrodes which are disposed at a site of the skin of a person to be treated where an electrical stimulation is to be given and which supply the electrical stimulation to the skin and a control unit which is connected electrically to the application electrodes to control a magnitude of a stimulation voltage which is supplied to the application electrodes, in which the control unit includes a calculation means for calculating a magnitude of the stimulation voltage which is to be output, depending on a first maximum stimulation voltage set for each person to be treated and an elapsed time or a stimulation frequency from the start of a stimulation session of a predetermined time, and an output means for outputting the stimulation voltage while increasing the voltage in a stepwise manner based on the calculation results of the calculation means.
