A grass cutter comprising: a mower deck configured to house a rotating blade for mowing grass therein; a blower configured to convey the grass mowed by the rotating blade to a grass collection vessel; a blower PTO transmission shaft connected with the blower; a drive force low-speed transmitting passage through which a drive force from a drive source is transmitted at low speed to a blower PTO hydraulic clutch; a drive force high-speed transmitting passage through which the drive force from the drive source is transmitted at high speed to the blower PTO hydraulic clutch; wherein the blower PTO hydraulic clutch is configured to connect the blower PTO transmission shaft with the drive force low-speed transmitting passage, connect the blower PTO transmission shaft with the drive force high-speed transmitting passage, and shift the blower PTO transmission shaft in a neutral state in which the blower PTO transmission shaft is not connected with the drive force low-speed transmitting passage and the drive force high-speed transmitting passage; a mower PTO transmission shaft configured to transmit the drive force to the rotating blade in the mower deck; a mower PTO hydraulic clutch configured to switch transmission and interruption of the drive force to mower PTO transmission shaft; a drive force transmitting gear configured to transmit the drive force from the drive source to the mower PTO hydraulic clutch; and an intermediate shaft which is disposed between the mower PTO transmission shaft and the blower PTO transmission shaft, and in which the drive force transmitting gear is installed; wherein the mower PTO transmission shaft transmits the drive force from the drive source, the drive force being transmitted via the drive force transmitting gear; and the blower PTO transmission shaft transmits the drive force from the intermediate shaft; characterized in that the blower PTO hydraulic clutch and the mower PTO hydraulic clutch are housed in a common clutch case, wherein the intermediate shaft includes a low-speed-side intermediate gear of the drive force low-speed transmitting passage and a high-speed-side intermediate gear of the drive force high-speed transmitting passage. a mower deck configured to house a rotating blade for mowing grass therein; a blower configured to convey the grass mowed by the rotating blade to a grass collection vessel; a blower PTO transmission shaft connected with the blower; a drive force low-speed transmitting passage through which a drive force from a drive source is transmitted at low speed to a blower PTO hydraulic clutch; a drive force high-speed transmitting passage through which the drive force from the drive source is transmitted at high speed to the blower PTO hydraulic clutch; wherein the blower PTO hydraulic clutch is configured to connect the blower PTO transmission shaft with the drive force low-speed transmitting passage, connect the blower PTO transmission shaft with the drive force high-speed transmitting passage, and shift the blower PTO transmission shaft in a neutral state in which the blower PTO transmission shaft is not connected with the drive force low-speed transmitting passage and the drive force high-speed transmitting passage; a mower PTO transmission shaft configured to transmit the drive force to the rotating blade in the mower deck; a mower PTO hydraulic clutch configured to switch transmission and interruption of the drive force to mower PTO transmission shaft; a drive force transmitting gear configured to transmit the drive force from the drive source to the mower PTO hydraulic clutch; and an intermediate shaft which is disposed between the mower PTO transmission shaft and the blower PTO transmission shaft, and in which the drive force transmitting gear is installed; a drive force transmitting gear configured to transmit the drive force from the drive source to the mower PTO hydraulic clutch; and an intermediate shaft which is disposed between the mower PTO transmission shaft and the blower PTO transmission shaft, and in which the drive force transmitting gear is installed; wherein the mower PTO transmission shaft transmits the drive force from the drive source, the drive force being transmitted via the drive force transmitting gear; and the blower PTO transmission shaft transmits the drive force from the intermediate shaft; characterized in that the blower PTO hydraulic clutch and the mower PTO hydraulic clutch are housed in a common clutch case, wherein the intermediate shaft includes a low-speed-side intermediate gear of the drive force low-speed transmitting passage and a high-speed-side intermediate gear of the drive force high-speed transmitting passage.