An industrial vehicle, comprising: a speed ratio detection unit (14,15) that detects a speed ratio of speed of an input axis and of an output axis of a torque convertor; a gearshift control unit that shifts up a speed stage of a transmission when the detected speed ratio is equal to or more than a first predetermined value and shifts down the speed stage of the transmission when the detected speed ratio is equal to or less than a second predetermined value, which is smaller than the first predetermined value; and a downshift switch that is operated by an operator to instruct a downshift from a second speed to a first speed to the gearshift control unit, characterized in that the gearshift control unit includes: an output unit that outputs a command of the first speed to a solenoid control unit which drives a solenoid-operated valve so as to shift a speed of the transmission; and a timer that starts counting a time from when the command of the first speed is outputted by the downshift switch, and when the downshift to the first speed is instructed by the downshift switch, the gearshift control unit controls automatic gearshift to be prohibited for a predetermined time period (ta) after an operation of the downshift switch such that the speed stage of the industrial vehicle is locked at the first speed state, regardless of the speed value detected by the speed ratio detection unit, the predetermined time period (ta) is set to be a standard time period required for the industrial vehicle to rush to earth and sand after the speed stage is shifted down to the first speed upon excavation working, and the gearshift control unit controls a minimum speed stage of the transmission to be the second speed unless the downshift switch is operated, and performs automatic gearshift of the transmission based on the speed ratio. a speed ratio detection unit (14,15) that detects a speed ratio of speed of an input axis and of an output axis of a torque convertor; a gearshift control unit that shifts up a speed stage of a transmission when the detected speed ratio is equal to or more than a first predetermined value and shifts down the speed stage of the transmission when the detected speed ratio is equal to or less than a second predetermined value, which is smaller than the first predetermined value; and a downshift switch that is operated by an operator to instruct a downshift from a second speed to a first speed to the gearshift control unit, characterized in that the gearshift control unit includes: an output unit that outputs a command of the first speed to a solenoid control unit which drives a solenoid-operated valve so as to shift a speed of the transmission; and a timer that starts counting a time from when the command of the first speed is outputted by the downshift switch, and an output unit that outputs a command of the first speed to a solenoid control unit which drives a solenoid-operated valve so as to shift a speed of the transmission; and a timer that starts counting a time from when the command of the first speed is outputted by the downshift switch, and when the downshift to the first speed is instructed by the downshift switch, the gearshift control unit controls automatic gearshift to be prohibited for a predetermined time period (ta) after an operation of the downshift switch such that the speed stage of the industrial vehicle is locked at the first speed state, regardless of the speed value detected by the speed ratio detection unit, the predetermined time period (ta) is set to be a standard time period required for the industrial vehicle to rush to earth and sand after the speed stage is shifted down to the first speed upon excavation working, and the gearshift control unit controls a minimum speed stage of the transmission to be the second speed unless the downshift switch is operated, and performs automatic gearshift of the transmission based on the speed ratio.