The numerical solutions of the existing lifting surface theories do not converge at the parabolic wing tip on account of the singularity, which is an obstacle to practical application to marine propellers. The method presented in the first and second reports overcomes the difficulty, and supplies the accurate solution even near the tip of propeller blade. In this third report, the measurement of the pressure on the propeller blade near the tip is performed. Experimental investigation reveals the following. (1) Characteristics of pressure on propeller blade near the tip are shown by the pressure measurement at γ/γ₀=0.900, 0.962 of a model propeller of the geometry magnifying the tip singularity. (2) Numerical results for lift density on blade obtained by the present method and the existing method are compared with experimental results, which makes clear the fact that the present method removes the defect in the existing methods. (3) The comparison of the pressure distribution on blade between the experimental results and the theoretical results by the combined method of present lifting surface theory and two-dimensional aerofoil theory reveals to what extent the theory can explain quantitatively the actual phenomenon near the tip of blade. (4) It is shown that the three-dimensional correction of thickness effect on pressure should be taken into account in order to improve further the theoretical method. A simple method based on the calculation of ellipsoid is considered to be convenient for the correction. (5) Under heavy load condition, the flow separation occurs at the tip of blade, which causes very low pressure on back side of blade tip. The phenomenon is not dealt with by the present method. In this respect further works are considered to be necessary in future.