A belt cleaner is provided in which a scraping portion (7) of a scraper (5) becomes in contact with the belt surface over the full width thereof even when the trough-shape of the belt surface is different from the shape as expected, thereby the leavings on the belt surface will be scraped off in an optimum manner. The scraper (5) is formed by a resiliently deformable blade which is curved and held in a holding groove (13) of a holder (6) so that the scraper (5) keeps an arcuate shape having a distance (L) between the central portion and the both side portions thereof with respect to the lengthwise direction of the belt. Shape shifting means (20) is provided in said holding groove (13) for transforming said scraper (5) into a desired curved configuration selected from among plural curved configurations differing said distance (L) thereby the scraper (5) is held to keep said selected curved configuration.
