An ultrasound probe includes, on a surface of a casing, a center indication part configured to indicate an approximate center position of at least one side of an ultrasound transmission/reception side surface of the piezoelectric element, and the center indication part is formed such that two or more tangents intersect each other at at least a first intersection and a second intersection on a virtual center line extending in an ultrasound transmission/reception direction of the piezoelectric element and passing through the approximate center position, and that the tangents intersecting each other have gradients of opposite signs.
