A marking system includes: an applicator that has a puncturing part capable of being punctured into a wall part of a luminal organ from an outside of the luminal organ a marker that is accommodated in the applicator and a pointer device including an insertion that has flexibility, is formed in an elongated manner, and is capable of being inserted into an inside of the luminal organ, and a light-emitting part that is disposed inside the insertion at a distance from a distal end of the insertion. An opening into which the puncturing part is capable of being inserted is formed at the distal end of the insertion. A leakage of light, which is emitted from the light-emitting part, to an outside of the insertion is suppressed between the light-emitting part and the distal end of the insertion.
