An automatic fecal and urinary treatment device includes: a mattress which has an approximately rectangular mounting hole formed in an approximately center portion thereof; a pedestal which has an upper surface of a concave arcuate shape and is configured to be fitted into the mounting hole; a support frame body which is mounted on the pedestal and has an outer bottom surface of a convex arcuate shape which conforms with the upper surface of a concave arcuate shape so as to allow the lateral swinging of the support frame body on the pedestal; a buttock placing pad which is mounted on an upper surface of the support frame body and forms a U-shaped cutout space in a center portion thereof; and a fecal and urinary treatment unit which is loosely fitted into the U-shaped cutout space formed in the buttock placing pad and is configured to perform washing of buttocks and private parts and discharging of urine and stools to the outside.