Trajectories of single silicon drops in linear shear flows of glycerol-water solutions were measured to evaluate the transverse lift forces acting on the drops. Experiments were conducted under the conditions of logM = -6.3 and -4.8, 0 < Re_D ≤ 23 and 3.2 ≤ ω ≤ 6.0 s^-1, where M is the Morton number, Re_D the drop Reynolds number, and ω the magnitude of the velocity gradient of the linear shear flow. The lift coefficient C_L was calculated from the measured drop trajectory. As a result, the following conclusions were obtained: (1) C_L of spherical drops steeply decreases to zero with increasing Re_D, (2) C_L of deformed drops decreases from positive to negative values with increasing Re_D, and (3) when the shear rate is large and C_L is positive, C_L takes a larger value for smaller M.