To provide a tool capable a user to stick a plaster to a place requiring the plaster easily by himself/herself.

The tool is for sticking a plaster comprising a peeling sheet temporarily stuck on top of medicine layers with laminated adhesive layers including a medicine. The tool mainly consists of a square curved board part 1 and a grip rod part 8 whose tip is connected to the curved board part at the center of an edge side 7 of the curved board part. The curved board part 1 has a projecting curved part, at least a part of which is parallel to an edge side 2 of the curved board part in the direction from the edge side 2 toward the opposite edge side 7. At least three slits 3, 4 and 5 are bored in this order from the edge side 2 toward the edge side 7 parallel to the edge side 2. The slit 3 is located between the edge side 2 and a point 12 in contact with a tangent 17 drawn from the grip end 9 of the grip rod part 8 on the convex plane (surface) of the curved board part 1. A part of the peeling sheet is peeled off from one edge side of the plaster, and the peeled end of the medicine layers is inserted into the slit 3 and temporarily fixed. The unpeeled part is inserted into the slit 4, and the peeled end of the peeling sheet is inserted into the slit 5. The tool also has a fixing device 6 for fixing the peeled part to the rear side of the grip rod part 8 so that the peeled part will not loosen when the peeled part is inserted into the slit 5.