To provide a cleaning brush for a joint capable of effectively and surely removing a stain of the joint by applying sufficient force to the bristle tip even when the brush is moved in either of front and rear direction.

Brush fibers 2 are implanted in a base 1 formed in a slender shape so as to form rows in the lengthwise direction of the base 1. Such fiber rows 3A, 3B, and 3C are arranged in plural rows in the width direction of the base 1. The brush fibers 2 are mutually inclined in the opposite direction toward the lengthwise direction of the base 1 between the adjacent fiber rows 3A, 3B, and 3C.