VARIABLE STATOR BLADE AND COMPRESSOR

The present invention is provided with: a stator blade body (41) having a radial end surface that forms a clearance with the outer peripheral surface of an inner casing; a rotary shaft that rotates soas to change the angle of the stator blade body (41) with respect to the direction of the main flow of the working fluid and that is connected to the radial end surface; and curved surface sections 50A-50D provided on blade surfaces (41ab) which are adjacent to the radial end surface and protrude to the outside of the rotary shaft, wherein the radii of curvature of the curved surface sections 50A-50D gradually decrease with distance from the rotary shaft. 具备：静叶片主体(41)，其具有在与内侧壳体的外周面之间形成空隙的径向端面；旋转轴，其以使静叶片主体(41)相对于工作流体的主流的流动方向的角度可变的方式旋转，并且与径向端面连接；以及曲面部(50A～50D)，其设置于向旋转轴的外侧突出的与径向端面相邻的叶片面(41ab)，曲面部(50A～50D)的曲率半径随着远离旋转轴而逐渐变小。