A protection body protecting the outer circumference of a drug retaining portion, which is provided at a distal portion of a medical elongated body and in which a drug is retained, by covering and sealing the outer circumference, includes a protection layer which is disposed around the outer circumference of the drug retaining portion along the medical elongated body and prevents external oxygen and moisture from coming into contact with the drug retaining portion； and an absorption portion which absorbs oxygen and moisture in a space in the inner circumference of the protection layer and in the outer circumference of the drug retaining portion.
