Hybrid girder

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A hybrid girder according to the present invention comprises : an I-shaped girder part arranged in a non-support section; and a box girder part connected to the I-shaped girder part and arranged in a support section to enhance structural strength in the support section. As configured above, the present invention is composed of the mixture of the I-shaped girder part and the box girder part so that the box girder part can be applied to the support section requiring structural strength and the I-shaped girder part can be applied to the other non-support section. Accordingly, structural constructability can be maintained and economical efficiency can be ensured. Moreover, a middle web panel, a closed partition wall, filling concrete, a round part or a tapered section part, a vertical reinforcing material and a horizontal reinforcing material are configured on the a bonding part for connecting the I-shaped girder part and the box girder part to reinforce stiffness while minimizing concentrated stress on the bonding part.