A bearing device comprising: a bushing formed in a U shape and including: an arc portion in which a cross section orthogonal to an axial direction has an arc shape; a first linear-shaped rotation suppressing portion that extends from a first end of an arc in the arc portion and includes a portion projecting outward from a circumcircle of the arc portion in the cross section orthogonal to the axial direction; and a second linear-shaped rotation suppressing portion that extends from a second end of the arc in the arc portion and includes a portion projecting outward from the circumcircle of the arc portion in the cross section orthogonal to the axial direction; a housing including a housing body and a lid, an upper portion of the housing body being open and covered with the lid, wherein the housing body accommodates the bushing; an inner tube; and a shaft that is accommodated in the inner tube, wherein the housing body supports the inner tube and the shaft via the bushing; characterized in that: an upper portion of the bushing facing the lid is open; the bearing device further comprises a spring configured to press down the inner tube and the shaft and arranged on the lid at a position corresponding to the bushing; a plurality of holes are formed in the lid into which pins are inserted; and the spring applies a load to washers which are provided between the pins and the inner tube. a bushing formed in a U shape and including: an arc portion in which a cross section orthogonal to an axial direction has an arc shape; a first linear-shaped rotation suppressing portion that extends from a first end of an arc in the arc portion and includes a portion projecting outward from a circumcircle of the arc portion in the cross section orthogonal to the axial direction; and a second linear-shaped rotation suppressing portion that extends from a second end of the arc in the arc portion and includes a portion projecting outward from the circumcircle of the arc portion in the cross section orthogonal to the axial direction; an arc portion in which a cross section orthogonal to an axial direction has an arc shape; a first linear-shaped rotation suppressing portion that extends from a first end of an arc in the arc portion and includes a portion projecting outward from a circumcircle of the arc portion in the cross section orthogonal to the axial direction; and a second linear-shaped rotation suppressing portion that extends from a second end of the arc in the arc portion and includes a portion projecting outward from the circumcircle of the arc portion in the cross section orthogonal to the axial direction; a housing including a housing body and a lid, an upper portion of the housing body being open and covered with the lid, wherein the housing body accommodates the bushing; an inner tube; and a shaft that is accommodated in the inner tube, wherein the housing body supports the inner tube and the shaft via the bushing; an upper portion of the bushing facing the lid is open; the bearing device further comprises a spring configured to press down the inner tube and the shaft and arranged on the lid at a position corresponding to the bushing; a plurality of holes are formed in the lid into which pins are inserted; and the spring applies a load to washers which are provided between the pins and the inner tube.