A work vehicle comprising: a gear transmission configured to vary power from a power source and output the power to a traveling device (6, 7); a transmission case containing the gear transmission; a first oil outlet port disposed at a lower portion in a bottom portion in one end side of the transmission case in a vehicle body front-back direction or in a vehicle body left-right direction, the first oil outlet port being configured to take out a lubricating oil from an interior of the transmission case; and a second oil outlet port disposed at an upper portion in the bottom portion in the one end side of the transmission case in the vehicle body front-back direction or in the vehicle body left-right direction, the second oil outlet port being configured to take out the lubricating oil from the interior of the transmission case, wherein the work vehicle includes a partition part dividing an internal space of the transmission case into a first space zone along a sidewall portion of the transmission case, and a second space zone other than the first space zone on another end side in the vehicle body front-back direction of the transmission case, the partition part keeping the first space zone in a sealed state; characterized in that the bottom portion includes a communication chamber formation member disposed on an outer surface of a sidewall portion of the transmission case, the communication chamber formation member being configured to form a communication chamber between itself and the sidewall portion; the first oil outlet port at the lower portion opens to a lower portion of the communication chamber formation member; the second oil outlet port at the upper portion opens to an upper portion of the communication chamber formation member; and a communication hole allowing the communication chamber to communicate with an internal space of the transmission case opens to a portion of the sidewall portion which is opposed to the first oil outlet port at the lower portion. a gear transmission configured to vary power from a power source and output the power to a traveling device (6, 7); a transmission case containing the gear transmission; a first oil outlet port disposed at a lower portion in a bottom portion in one end side of the transmission case in a vehicle body front-back direction or in a vehicle body left-right direction, the first oil outlet port being configured to take out a lubricating oil from an interior of the transmission case; and a second oil outlet port disposed at an upper portion in the bottom portion in the one end side of the transmission case in the vehicle body front-back direction or in the vehicle body left-right direction, the second oil outlet port being configured to take out the lubricating oil from the interior of the transmission case, wherein the work vehicle includes a partition part dividing an internal space of the transmission case into a first space zone along a sidewall portion of the transmission case, and a second space zone other than the first space zone on another end side in the vehicle body front-back direction of the transmission case, the partition part keeping the first space zone in a sealed state; characterized in that the bottom portion includes a communication chamber formation member disposed on an outer surface of a sidewall portion of the transmission case, the communication chamber formation member being configured to form a communication chamber between itself and the sidewall portion; the first oil outlet port at the lower portion opens to a lower portion of the communication chamber formation member; the second oil outlet port at the upper portion opens to an upper portion of the communication chamber formation member; and a communication hole allowing the communication chamber to communicate with an internal space of the transmission case opens to a portion of the sidewall portion which is opposed to the first oil outlet port at the lower portion.