A work vehicle comprising: a vehicle body frame with a baseplate disposed on a front end thereof, a front-opening hood attached to a front side of the vehicle body frame so as to be capable of rocking upward and downward, and a lock mechanism for anchoring and holding the hood in a lower closed position; the lock mechanism comprising a first member mounted at a central location with respect to the left-right direction on an upper side of the baseplate so as to be capable of moving between a lock position and an unlock position, a second member anchored at a central location with respect to the left-right direction on a lower part of the front end of the hood, a biasing member for biasing the first member back to the lock position, and a manipulation tool for manipulating the first member to the unlock position in resistance to the action of the biasing member; the first member engaging with the second member, thereby anchoring and retaining the hood at the closed position, by being positioned at the lock position through the action of the biasing member when the hood is positioned at the closed position, and disengaging from the second member, thereby releasing the anchoring and retention of the hood at the closed position, by being manipulated to the unlock position by the manipulation tool when the hood is anchored and retained at the closed position; Characterised by a through-hole through which the manipulation tool is inserted and withdrawn being formed at a position on a left or right end of the baseplate; and the manipulation tool being configured so as to be capable of being inserted and withdrawn through the through-hole in a left or right upward diagonal direction from a position below the through-hole on the outside of one side of the vehicle body, and being inserted and withdrawn through the through-hole in the left or right upward diagonal direction to manipulate the first member to the unlock position, wherein the vehicle body frame is configured to enable an attachment of a front-mounted implement. a vehicle body frame with a baseplate disposed on a front end thereof, a front-opening hood attached to a front side of the vehicle body frame so as to be capable of rocking upward and downward, and a lock mechanism for anchoring and holding the hood in a lower closed position; the lock mechanism comprising a first member mounted at a central location with respect to the left-right direction on an upper side of the baseplate so as to be capable of moving between a lock position and an unlock position, a second member anchored at a central location with respect to the left-right direction on a lower part of the front end of the hood, a biasing member for biasing the first member back to the lock position, and a manipulation tool for manipulating the first member to the unlock position in resistance to the action of the biasing member; the first member engaging with the second member, thereby anchoring and retaining the hood at the closed position, by being positioned at the lock position through the action of the biasing member when the hood is positioned at the closed position, and disengaging from the second member, thereby releasing the anchoring and retention of the hood at the closed position, by being manipulated to the unlock position by the manipulation tool when the hood is anchored and retained at the closed position; Characterised by a through-hole through which the manipulation tool is inserted and withdrawn being formed at a position on a left or right end of the baseplate; and the manipulation tool being configured so as to be capable of being inserted and withdrawn through the through-hole in a left or right upward diagonal direction from a position below the through-hole on the outside of one side of the vehicle body, and being inserted and withdrawn through the through-hole in the left or right upward diagonal direction to manipulate the first member to the unlock position, wherein the vehicle body frame is configured to enable an attachment of a front-mounted implement.