A gearshift lever device, comprising: a gearshift lever including an operation portion formed on an upper end portion and a shaft support portion formed on a lower end portion; and a select lever including a holding portion that holds the shaft support portion of the gearshift lever, wherein the gearshift lever is supported to be shiftable relative to a main body case in a select direction, representing a vehicle right - left direction, and is supported to be shiftable relative to the main body case in the shift direction, representing a vehicle front - rear direction, f wherein the gearshift lever device comprises shift operation positions and select operation positions displaced from each other in the select direction of the gearshift lever, the select lever further includes a pair of shift direction side wall portions which are disposed across the holding portion with a distance from each other in the shift direction of the gearshift lever, and engage portions which are disposed on the shift direction side wall portions and are to be engaged with the gearshift lever, the shift direction side wall portions include first shift direction side wall portions disposed for the shift operation positions and second shift direction side wall portions disposed for the select operation positions, the engage portions include first engage portions engaged with the gearshift lever in the shift operation positions and second engage portions engaged with the gearshift lever in the select operation positions characterized in that the select lever includes a select lever main body in which first engage portions and second engage portions are formed, and a select lever plate for reinforcement inserted in the select lever main body, and the select lever plate is formed to have U-shapes, including first plate portions that reinforce the first engage portions, second plate portions that reinforce the second engage portions, and connecting portions that are arranged to extend along a select direction of the gearshift lever and connect the first plate portions and the second plate portions. a gearshift lever including an operation portion formed on an upper end portion and a shaft support portion formed on a lower end portion; and a select lever including a holding portion that holds the shaft support portion of the gearshift lever, wherein the gearshift lever is supported to be shiftable relative to a main body case in a select direction, representing a vehicle right - left direction, and is supported to be shiftable relative to the main body case in the shift direction, representing a vehicle front - rear direction, f wherein the gearshift lever device comprises shift operation positions and select operation positions displaced from each other in the select direction of the gearshift lever, the select lever further includes a pair of shift direction side wall portions which are disposed across the holding portion with a distance from each other in the shift direction of the gearshift lever, and engage portions which are disposed on the shift direction side wall portions and are to be engaged with the gearshift lever, the shift direction side wall portions include first shift direction side wall portions disposed for the shift operation positions and second shift direction side wall portions disposed for the select operation positions, the engage portions include first engage portions engaged with the gearshift lever in the shift operation positions and second engage portions engaged with the gearshift lever in the select operation positions characterized in that the select lever includes a select lever main body in which first engage portions and second engage portions are formed, and a select lever plate for reinforcement inserted in the select lever main body, and the select lever plate is formed to have U-shapes, including first plate portions that reinforce the first engage portions, second plate portions that reinforce the second engage portions, and connecting portions that are arranged to extend along a select direction of the gearshift lever and connect the first plate portions and the second plate portions.