A stirring device comprising; a stirring container supported with a device frame, and a rotary operating part/motor unit, in which a rotary operating part and a motor part are coaxially and integrally formed and linked with each other, attached to a bottom part of the stirring container at a slant so that a rotational axis is inclined downward toward an outside of the stirring container, the motor part side protruding outside the stirring container and the rotary operating part facing inside the stirring container, the device frame being provided with legs, characterized in that the stirring container is provided with a reinforcement base attached on the bottom side, a supporting stand is provided to support the rotary operating part/motor unit to the reinforcement base or the device frame, a weight-measuring instrument is provided to indirectly measure a change in weight of a stirring substance in the stirring container during a rotation operation of the rotary operating part/motor unit, a closed reinforced structure (69, 71) is configured to include the stirring container, the rotary operating part/motor unit, the reinforcement base, and the supporting stand as reinforcing members, and the reinforcement base is attached to the bottom part of the stirring container by an uprising frame, and the closed shape of the reinforced structure (69, 71) is a locked chain structure that comprises three sides in which a side depends on the stirring container, the rotary operating part/motor unit, and the supporting stand, a side depends on the reinforcement base, and a side depends on the uprising frame. a stirring container supported with a device frame, and a rotary operating part/motor unit, in which a rotary operating part and a motor part are coaxially and integrally formed and linked with each other, attached to a bottom part of the stirring container at a slant so that a rotational axis is inclined downward toward an outside of the stirring container, the motor part side protruding outside the stirring container and the rotary operating part facing inside the stirring container, the device frame being provided with legs, characterized in that the stirring container is provided with a reinforcement base attached on the bottom side, a supporting stand is provided to support the rotary operating part/motor unit to the reinforcement base or the device frame, a weight-measuring instrument is provided to indirectly measure a change in weight of a stirring substance in the stirring container during a rotation operation of the rotary operating part/motor unit, a closed reinforced structure (69, 71) is configured to include the stirring container, the rotary operating part/motor unit, the reinforcement base, and the supporting stand as reinforcing members, and the reinforcement base is attached to the bottom part of the stirring container by an uprising frame, and the closed shape of the reinforced structure (69, 71) is a locked chain structure that comprises three sides in which a side depends on the stirring container, the rotary operating part/motor unit, and the supporting stand, a side depends on the reinforcement base, and a side depends on the uprising frame.