A gum massaging device includes a sheet member closely attachable to a gum, a gum-condition sensor disposed on the sheet member, and a massaging element disposed on the sheet member at a position corresponding to a position at which the gum-condition sensor is disposed, the massaging element operating in accordance with a detection result from the gum-condition sensor. The gum-condition sensor detects, for example, a color tone of a portion of the gum adjacent to the gum-condition sensor. The massaging element provides, for example, a pinching massage to a portion of the gum adjacent to the massaging element.
