A bearing device includes: an inner ring member through which a shaft is passed and which is supported rotatably about an axis of the shaft and includes an inner ring raceway surface; an outer ring member arranged concentrically with the inner ring member and including an outer ring raceway surface; a plurality of rollers arranged rollably between the inner ring raceway surface and the outer ring raceway surface; a lubricating path through which lubricant is supplied to at least one of the inner ring raceway surface and the outer ring raceway surface; and a lubricating device which supplies the lubricant to the lubricating path according to rotating speed of the inner ring member about the axis.