A toothbrush comprising: a head portion provided on a tip end side in a long axis direction and having a bristle tufting surface; a grip portion disposed on a rear end side in the long axis direction from the head portion; a neck portion disposed between the bristle tufting surface and the grip portion; and a sound generation portion that generates a click sound due to deformation when an external force in a first direction orthogonal to the bristle tufting surface exceeds a threshold value, the sound generation portion being provided on the rear end side from the bristle tufting surface, wherein the sound generation portion includes: a reversal portion that generates the click sound by being snapped, buckled, and reversed as the head portion is displaced on a back surface side opposite to the bristle tufting surface in the first direction due to the external force exceeding the threshold value; and an elastic deformation portion that connects a first region on the tip end side of the sound generation portion and a second region on the rear end side of the sound generation portion, and elastically deforms at least up to the external force at which the sound generation portion generates the click sound, and wherein the elastic deformation portion and the reversal portion are disposed with a gap in a second direction orthogonal to the first direction and the long axis direction, characterized in that two elastic deformation portions extending along in the long axis direction are arranged side by side in the second direction, the reversal portion extending along in the long axis direction is disposed between the two elastic deformation portions arranged in the second direction, the gap along in the long axis direction is disposed between the two elastic deformation portions and the reversal portion arranged in the second direction. a head portion provided on a tip end side in a long axis direction and having a bristle tufting surface; a grip portion disposed on a rear end side in the long axis direction from the head portion; a neck portion disposed between the bristle tufting surface and the grip portion; and a sound generation portion that generates a click sound due to deformation when an external force in a first direction orthogonal to the bristle tufting surface exceeds a threshold value, the sound generation portion being provided on the rear end side from the bristle tufting surface, wherein the sound generation portion includes: a reversal portion that generates the click sound by being snapped, buckled, and reversed as the head portion is displaced on a back surface side opposite to the bristle tufting surface in the first direction due to the external force exceeding the threshold value; and an elastic deformation portion that connects a first region on the tip end side of the sound generation portion and a second region on the rear end side of the sound generation portion, and elastically deforms at least up to the external force at which the sound generation portion generates the click sound, and a reversal portion that generates the click sound by being snapped, buckled, and reversed as the head portion is displaced on a back surface side opposite to the bristle tufting surface in the first direction due to the external force exceeding the threshold value; and an elastic deformation portion that connects a first region on the tip end side of the sound generation portion and a second region on the rear end side of the sound generation portion, and elastically deforms at least up to the external force at which the sound generation portion generates the click sound, and wherein the elastic deformation portion and the reversal portion are disposed with a gap in a second direction orthogonal to the first direction and the long axis direction, characterized in that two elastic deformation portions extending along in the long axis direction are arranged side by side in the second direction, the reversal portion extending along in the long axis direction is disposed between the two elastic deformation portions arranged in the second direction, the gap along in the long axis direction is disposed between the two elastic deformation portions and the reversal portion arranged in the second direction.