Patent ID: 7478948

Claim:
An X-ray diagnostic apparatus comprising: a support mechanism that supports an arm provided with an X-ray tube at one end and an imager at the other end; and a rotary mechanism that makes the support mechanism rotatable; the rotary mechanism including a bearing, an outer-ring holder and an inner-ring holder; the bearing including a rolling element, an outer-ring housing member and an inner-ring housing member, the outer-ring and inner-ring housing members being to slide through the rolling element; the outer-ring holder having a grooved opening supporting the outer-ring housing member of the bearing; the inner-ring holder having a grooved opening supporting the inner-ring housing member of the bearing; at least one of the outer-ring and inner-ring housing members being vertically divided into two parts; the grooved opening of the outer-ring holder or the inner-ring holder on a side of the two-divided housing member having a dimension smaller than a vertical dimension of the two-divided housing member with which the rolling element is in contact with the two-divided housing member.