PURPOSE: To provide a caddie bag with a multi-purpose reinforcing core material preventing its deformation, capable of being used over a long period, and capable of being reinforced without relatively increasing the weight.

CONSTITUTION: This caddie bag with a multi-purpose reinforcing core material is constituted of a core material 14 and an outer material 12 covering the outer periphery of the core material 14. The core material 14 is constituted of the first reinforcing material 22 formed with through holes to be inserted with golf clubs and integrally molded into a ring shape and the second reinforcing material 24 formed with through holes to be inserted with the golf clubs and formed with a plastic plate into a cylindrical shape. A fit section is formed on part of the first reinforcing mateial 22 fittably to a stand or a cart, and the fit section is exposed from the outer material 12 so that it can be removably fixed to the stand or the cart.