A multi-stage transmission that changes speed of power transmitted from a motor of a vehicle to an input member to transmit the power to an output member, the multi-stage transmission comprising: a Ravigneaux type planetary gear mechanism including an input element to which power is transmitted from the input member, a fixable element, a first output element, and a second output element; a first planetary gear and a second planetary gear each including a plurality of rotating elements; a first brake that connects the fixable element of the Ravigneaux type planetary gear mechanism to a stationary member to hold the fixable element stationary and releases this connection; a first clutch that interconnects the first output element of the Ravigneaux type planetary gear mechanism with at least one of the rotating elements of the first and the second planetary gears (21, 22) and releases this interconnection; and a second clutch that interconnects the second output element of the Ravigneaux type planetary gear mechanism with at least one of the rotating elements of the first and the second planetary gears (21, 22) and releases this interconnection, characterized in that when the fixable element is held stationary by the first brake, the Ravigneaux typeplanetary gear mechanism increases speed of power transmitted to the input element so that rotation speed of the second output element becomes higher than rotation speed of the first output element, and transmits the power to the first and the second output elements (23r, 23s), and a second engagement oil chamber and a second centrifugal oil pressure cancel chamber of the second clutch are defined by a piston that rotates integrally with the second output element, wherein engagement oil pressure supplied to the engagement oil chamber moves the piston that presses friction plates and separator plates to cause these plates (201, 202) to frictionally engage with each other, and the second centrifugal oil pressure cancel chamber cancels the engagement oil pressure generated in the engagement oil chamber. a Ravigneaux type planetary gear mechanism including an input element to which power is transmitted from the input member, a fixable element, a first output element, and a second output element; a first planetary gear and a second planetary gear each including a plurality of rotating elements; a first brake that connects the fixable element of the Ravigneaux type planetary gear mechanism to a stationary member to hold the fixable element stationary and releases this connection; a first clutch that interconnects the first output element of the Ravigneaux type planetary gear mechanism with at least one of the rotating elements of the first and the second planetary gears (21, 22) and releases this interconnection; and a second clutch that interconnects the second output element of the Ravigneaux type planetary gear mechanism with at least one of the rotating elements of the first and the second planetary gears (21, 22) and releases this interconnection, characterized in that when the fixable element is held stationary by the first brake, the Ravigneaux typeplanetary gear mechanism increases speed of power transmitted to the input element so that rotation speed of the second output element becomes higher than rotation speed of the first output element, and transmits the power to the first and the second output elements (23r, 23s), and a second engagement oil chamber and a second centrifugal oil pressure cancel chamber of the second clutch are defined by a piston that rotates integrally with the second output element, wherein engagement oil pressure supplied to the engagement oil chamber moves the piston that presses friction plates and separator plates to cause these plates (201, 202) to frictionally engage with each other, and the second centrifugal oil pressure cancel chamber cancels the engagement oil pressure generated in the engagement oil chamber.