A circular turbulent wall-jet along a convex wall was measured in comparison with that along a flat plate, and the flow characteristics of the three-dimensional wall-jet under a streamwise curvature effect was examined. By hot-wire anemometry, all velocity components were measured so that the components of turbulent intensity, the Reynolds stresses, and the mean streamwise vorticity were fiqured out. The main conclusions are as follows : 1) there are two pairs of secondary flows in the circular wall-jet along a flat plate, 2) an additional pair of secondary flows appears in the case of the flow along a convex wall 3) as an effect of curvature, the wall static pressure along the centerline decreases considerably, and 4) a significant increase of the vertical jet width compared with that of the spanwise one is observed.