To provide a brush such as toothbrush wherein the brushing efficiency does not greatly deteriorate as the using time passes, and which can be used for a long period of time with a favorable using feeling, and has a long service life.

A pair piece comprising two pieces 31 wherein a partial flocked part including one each of flocked parts at confronted parts on the outer contour of a synthetic flocked part which is formed at the time of one arrangement, is provided. Then, the arrangement of the tow pieces 31 to each other is made exchangeable in such a manner that when being seen from the flocking direction at the time of one arrangement, the outer contour parts of the partial flocked parts of both pieces 31 which are confronted with each other facing inward while being pinched between both flocked parts on the confronted parts of the outer contours of the synthetic flocked parts may be confronted with each other facing outward while pinching both flocked parts of the confronted parts of the outer contours of the synthetic flocked parts in-between, at the time of another arrangement.