This contact-angle measurement method is a contact-angle measurement method for measuring a contact angle (γ) between a droplet that is supplied to a sample curved surface and the sample curved surface. This method includes an apparent contact-angle calculation step of calculating an apparent contact-angle (α) of the droplet by using a captured image of the droplet supplied to the sample curved surface and the sample curved surface; an inclination angle calculation step of calculating an inclination angle (β) of the sample curved surface at an outer periphery portion of a contact portion between the droplet and the sample curved surface by using the captured image; and a contact-angle calculation step of calculating the contact angle (γ) by correcting the apparent contact angle (α), using the inclination angle (β).