To provide a dental treatment chair that once the position for a gargle or the position for treatment is adjusted during treatment, afterwards these positions are modified automatically.

When a patient is short such as a child, a dentist or a dental assistant raise the treatment chair 1 by manual operation and adjust it to the height (the gargle position) the patient can gargle easily (Figure 1 (D)). After an adjustment, when the M/A button is pushed, the gargle position is stored in memory bank and the treatment chair is shifted to the treatment position (Figure 1 (E)). When the M/A button is pushed afterwards, the treatment chair is modified to the adjusted height automatically (Figure 1 (F)), and it is not necessary to readjust a height of the treatment chair by manual operation.