PURPOSE: To provide a cutting tool for a thin wall shaped product, while the safety thereof being enhanced via the reduction of the exposure of a cutter section.

CONSTITUTION: A cutting tool 10 for a thin wall molded product is formed out of a cutter blade 11 and a cutter body holder 12 for detachably holding the blade 11. Also, the holder 12 is formed out of a pair of holder bodies 13 and 14 detachably fixed to each other in superposed state, while the blade 11 being held thereon in clamped state. The holder 12 has an insertion groove section 15 allowing the free detachment or insertion of a corrugated tube and holding the edge section 11a of the the blade 11 in exposed state, as well as a holding section 20 for covering the blade 11. The opposite side 14c of the second holder body 14 is provided with a coupling recess section 16 where the blade 11 is housed and held in positioned state. In this case, the holder bodies 13 and 14 as a pair are made of aluminum material and formed into a sheet metal.