A drum type washing machine, provided with: an outer tank, configured in a housing; a drum, configured in the outer tank and is capable of rotating by using a horizontal axis or an inclination axis inclining relative to a horizontal direction as a center; a stirring body, configured at a rear part of the drum and provided, on a surface of the stirring body, with a protruding part in contact with washings; a driving unit, configured to enable the drum and the stirring body to rotate; and a control part, configured to control working of the driving unit; characterized in that, the driving unit comprises: a driving motor; a wing shaft, configured to transmit rotation of the driving motor to the stirring body; a drum shaft, configured to transmit rotation of the driving motor to the drum; and a clutch mechanism part, configured to switch a driving form of the driving unit between a first-shaft driving form and a second-shaft driving form, wherein the first-shaft driving form is a form that enables the wing shaft and the drum shaft to integrally rotate at a same rotation speed, and the second-shaft driving form is a form that enables the wing shaft and the drum shaft to respectively rotate at different rotation speeds, wherein the clutch mechanism part comprises: a clutch body provided with an engaging flange part, wherein by moving the clutch body to a first position so as to engage the engaging flange part at the first position with an engaged recess that rotates with rotation of the driving motor, the driving form is switched to the first-shaft driving form; the control part executes first-shaft switching treatment to carry out switching from the second-shaft driving form to the first-shaft driving form, wherein the first-shaft switching treatment is treatment that enables the clutch mechanism part to work to move the clutch body to the first position and then enables the driving motor to rotate to engage the engaging flange part in unengaged state and the engaged recess; a plurality of first concave-convex parts are arranged at an outer circumferential part and the whole circumference of the engaging flange part, and a plurality of second concave-convex parts are arranged at an outer circumferential part and the whole circumference of the engaged recess; the engaging flange part is in a shape the same as that of the engaged recess; the first concave-convex parts and the second concave-convex parts are engaged with each other when the engaging flange part is inserted into the engaged recess. an outer tank, configured in a housing; a drum, configured in the outer tank and is capable of rotating by using a horizontal axis or an inclination axis inclining relative to a horizontal direction as a center; a stirring body, configured at a rear part of the drum and provided, on a surface of the stirring body, with a protruding part in contact with washings; a driving unit, configured to enable the drum and the stirring body to rotate; and a control part, configured to control working of the driving unit; characterized in that, the driving unit comprises: a driving motor; a wing shaft, configured to transmit rotation of the driving motor to the stirring body; a drum shaft, configured to transmit rotation of the driving motor to the drum; and a clutch mechanism part, configured to switch a driving form of the driving unit between a first-shaft driving form and a second-shaft driving form, wherein the first-shaft driving form is a form that enables the wing shaft and the drum shaft to integrally rotate at a same rotation speed, and the second-shaft driving form is a form that enables the wing shaft and the drum shaft to respectively rotate at different rotation speeds, wherein a driving motor; a wing shaft, configured to transmit rotation of the driving motor to the stirring body; a drum shaft, configured to transmit rotation of the driving motor to the drum; and a clutch mechanism part, configured to switch a driving form of the driving unit between a first-shaft driving form and a second-shaft driving form, wherein the first-shaft driving form is a form that enables the wing shaft and the drum shaft to integrally rotate at a same rotation speed, and the second-shaft driving form is a form that enables the wing shaft and the drum shaft to respectively rotate at different rotation speeds, wherein the clutch mechanism part comprises: a clutch body provided with an engaging flange part, wherein by moving the clutch body to a first position so as to engage the engaging flange part at the first position with an engaged recess that rotates with rotation of the driving motor, the driving form is switched to the first-shaft driving form; the control part executes first-shaft switching treatment to carry out switching from the second-shaft driving form to the first-shaft driving form, wherein the first-shaft switching treatment is treatment that enables the clutch mechanism part to work to move the clutch body to the first position and then enables the driving motor to rotate to engage the engaging flange part in unengaged state and the engaged recess; a plurality of first concave-convex parts are arranged at an outer circumferential part and the whole circumference of the engaging flange part, and a plurality of second concave-convex parts are arranged at an outer circumferential part and the whole circumference of the engaged recess; the engaging flange part is in a shape the same as that of the engaged recess; the first concave-convex parts and the second concave-convex parts are engaged with each other when the engaging flange part is inserted into the engaged recess.