A hydraulic control device for a forklift comprising: a plurality of hydraulic mechanisms (14, 19), wherein the hydraulic mechanisms (14, 19) include a lifting/lowering hydraulic cylinder that lifts and lowers a fork by supplying and discharging hydraulic oil in accordance with an operation of a lifting/lowering instruction member, and a tilting hydraulic cylinder that tilts a mast, on which the fork is mounted, by supplying and discharging hydraulic oil in accordance with an operation of a tilting instruction member; a hydraulic pump; an electric motor that drives the hydraulic pump, characterised in that a discharge control mechanism arranged between the lifting/lowering hydraulic cylinder and the hydraulic pump, wherein the discharge control mechanism allows hydraulic oil to be discharged from the lifting/lowering hydraulic cylinder to the hydraulic pump when lowering the fork and stops the discharge of hydraulic oil from the lifting/lowering hydraulic cylinder to the hydraulic pump when stopping or lifting the fork; a proportional valve arranged between the discharge control mechanism and a drain; a flow rate control valve arranged between the discharge control mechanism and the drain, wherein the flow rate control valve opens at an open degree that is in accordance with a pressure difference between a front side and a rear side of the proportional valve; and a controller that controls and drives the motor, wherein when the lifting/lowering hydraulic cylinder performs a lowering operation of the fork and a hydraulic mechanism other than the lifting/lowering hydraulic cylinder simultaneously performs a further operation, the controller controls an open degree of the proportional valve in accordance with a rotation speed difference of a required lowering operation rotation speed for the hydraulic pump, which is required to perform the lowering operation at an instructed speed that is in accordance with an operation amount of the lifting/lowering instruction member, and a required further operation rotation speed for the hydraulic pump, which is required to perform the further operation. a plurality of hydraulic mechanisms (14, 19), wherein the hydraulic mechanisms (14, 19) include a lifting/lowering hydraulic cylinder that lifts and lowers a fork by supplying and discharging hydraulic oil in accordance with an operation of a lifting/lowering instruction member, and a tilting hydraulic cylinder that tilts a mast, on which the fork is mounted, by supplying and discharging hydraulic oil in accordance with an operation of a tilting instruction member; a hydraulic pump; an electric motor that drives the hydraulic pump, characterised in that a discharge control mechanism arranged between the lifting/lowering hydraulic cylinder and the hydraulic pump, wherein the discharge control mechanism allows hydraulic oil to be discharged from the lifting/lowering hydraulic cylinder to the hydraulic pump when lowering the fork and stops the discharge of hydraulic oil from the lifting/lowering hydraulic cylinder to the hydraulic pump when stopping or lifting the fork; a proportional valve arranged between the discharge control mechanism and a drain; a flow rate control valve arranged between the discharge control mechanism and the drain, wherein the flow rate control valve opens at an open degree that is in accordance with a pressure difference between a front side and a rear side of the proportional valve; and a controller that controls and drives the motor, wherein when the lifting/lowering hydraulic cylinder performs a lowering operation of the fork and a hydraulic mechanism other than the lifting/lowering hydraulic cylinder simultaneously performs a further operation, the controller controls an open degree of the proportional valve in accordance with a rotation speed difference of a required lowering operation rotation speed for the hydraulic pump, which is required to perform the lowering operation at an instructed speed that is in accordance with an operation amount of the lifting/lowering instruction member, and a required further operation rotation speed for the hydraulic pump, which is required to perform the further operation.