A lubricating oil supply apparatus, comprising: a rotational shaft including a hollow lubricating oil supply path formed along a longitudinal direction of the rotational shaft; a lubricating oil supply portion installed at a lower end of the rotational shaft to supply lubricating oil to the lubricating oil supply path; a bypass hole provided on a side surface of the rotational shaft to allow an outer space of the rotational shaft and the lubricating oil supply path to communicate with each other therethrough; and a valve body installed on the rotational shaft to open or close the bypass hole, wherein the valve body comprises: a valve provided at a location for opening or closing the bypass hole; a valve housing fixed to the rotational shaft and including a leakage hole through which lubricating oil having passed through the bypass hole is discharged; and a spring supported by the valve housing and elastically pressing the valve in a direction toward the center of the rotational shaft, wherein the valve and the spring are embedded in a chamber defined by the valve housing, and wherein a degree of opening of the bypass hole by the valve is determined at least based on a degree of a centrifugal force applied to the valve, and wherein the centrifugal force is generated by rotation of the rotational shaft and a weight of the valve, and allows the valve to move in a direction away from the center of the rotational shaft while overcoming an elastic force of the spring, characterized in that the lubricating oil supply portion comprises a rotational portion fixed to the rotational shaft to rotate together with the rotational shaft, and the rotational portion is provided with the valve housing. a rotational shaft including a hollow lubricating oil supply path formed along a longitudinal direction of the rotational shaft; a lubricating oil supply portion installed at a lower end of the rotational shaft to supply lubricating oil to the lubricating oil supply path; a bypass hole provided on a side surface of the rotational shaft to allow an outer space of the rotational shaft and the lubricating oil supply path to communicate with each other therethrough; and a valve body installed on the rotational shaft to open or close the bypass hole, wherein the valve body comprises: a valve provided at a location for opening or closing the bypass hole; a valve housing fixed to the rotational shaft and including a leakage hole through which lubricating oil having passed through the bypass hole is discharged; and a spring supported by the valve housing and elastically pressing the valve in a direction toward the center of the rotational shaft, wherein the valve and the spring are embedded in a chamber defined by the valve housing, and a valve provided at a location for opening or closing the bypass hole; a valve housing fixed to the rotational shaft and including a leakage hole through which lubricating oil having passed through the bypass hole is discharged; and a spring supported by the valve housing and elastically pressing the valve in a direction toward the center of the rotational shaft, wherein the valve and the spring are embedded in a chamber defined by the valve housing, and wherein a degree of opening of the bypass hole by the valve is determined at least based on a degree of a centrifugal force applied to the valve, and wherein the centrifugal force is generated by rotation of the rotational shaft and a weight of the valve, and allows the valve to move in a direction away from the center of the rotational shaft while overcoming an elastic force of the spring, characterized in that the lubricating oil supply portion comprises a rotational portion fixed to the rotational shaft to rotate together with the rotational shaft, and the rotational portion is provided with the valve housing.