A construction vehicle, comprising: a vehicle body frame; a power compartment accommodating an engine mounted on the vehicle body frame; a cooling compartment disposed rearwards of the power compartment; a cooling device disposed within the cooling compartment, the cooling device including a plurality of heat exchangers; and a cooling fan disposed within the cooling compartment, the cooling fan configured to form a cooling wind flow path for inhaling outdoor air and directing the inhaled outdoor air towards the cooling device, wherein the cooling device includes: a radiator disposed on the vehicle body frame along a roughly vertical direction; and an oil cooler disposed adjacent to the radiator for arranging a rear surface side thereof to be faced in roughly parallel to a lower part of a front surface of the radiator; characterized by an first opening/closing mechanism including a rotary shaft, the rotary shaft (31 a) obliquely disposed for arranging a top end portion thereof closer to the front surface of the radiator than a bottom end portion thereof is, the first opening/closing mechanism configured to pivot the oil cooler about the rotary shaft (31 a) and simultaneously move the oil cooler with respect to the radiator, an after-cooler disposed adjacent to the radiator with a rear surface side thereof being arranged to be faced to an upper part of the front surface of the radiator, an air conditioner condenser disposed adjacent to the after-cooler with a rear surface side thereof being arranged facing a front surface of the after-cooler, the first opening/closing mechanism being configured to pivot the oil cooler unobstructedly with respect to the after-cooler and the air conditioner condenser between an open position and a closed position, and either a counterweight mounted on a rear part of the vehicle body frame or a part of the vehicle body frame is disposed on a line horizontally extended from a bottom end portion of the oil cooler. a vehicle body frame; a power compartment accommodating an engine mounted on the vehicle body frame; a cooling compartment disposed rearwards of the power compartment; a cooling device disposed within the cooling compartment, the cooling device including a plurality of heat exchangers; and a cooling fan disposed within the cooling compartment, the cooling fan configured to form a cooling wind flow path for inhaling outdoor air and directing the inhaled outdoor air towards the cooling device, wherein the cooling device includes: a radiator disposed on the vehicle body frame along a roughly vertical direction; and an oil cooler disposed adjacent to the radiator for arranging a rear surface side thereof to be faced in roughly parallel to a lower part of a front surface of the radiator; characterized by an first opening/closing mechanism including a rotary shaft, the rotary shaft (31 a) obliquely disposed for arranging a top end portion thereof closer to the front surface of the radiator than a bottom end portion thereof is, the first opening/closing mechanism configured to pivot the oil cooler about the rotary shaft (31 a) and simultaneously move the oil cooler with respect to the radiator, an after-cooler disposed adjacent to the radiator with a rear surface side thereof being arranged to be faced to an upper part of the front surface of the radiator, an air conditioner condenser disposed adjacent to the after-cooler with a rear surface side thereof being arranged facing a front surface of the after-cooler, a radiator disposed on the vehicle body frame along a roughly vertical direction; and an oil cooler disposed adjacent to the radiator for arranging a rear surface side thereof to be faced in roughly parallel to a lower part of a front surface of the radiator; characterized by an first opening/closing mechanism including a rotary shaft, the rotary shaft (31 a) obliquely disposed for arranging a top end portion thereof closer to the front surface of the radiator than a bottom end portion thereof is, the first opening/closing mechanism configured to pivot the oil cooler about the rotary shaft (31 a) and simultaneously move the oil cooler with respect to the radiator, an after-cooler disposed adjacent to the radiator with a rear surface side thereof being arranged to be faced to an upper part of the front surface of the radiator, an air conditioner condenser disposed adjacent to the after-cooler with a rear surface side thereof being arranged facing a front surface of the after-cooler, the first opening/closing mechanism being configured to pivot the oil cooler unobstructedly with respect to the after-cooler and the air conditioner condenser between an open position and a closed position, and either a counterweight mounted on a rear part of the vehicle body frame or a part of the vehicle body frame is disposed on a line horizontally extended from a bottom end portion of the oil cooler.