The present invention mainly relates to briquettes which are widely used for heating of the common people. More specifically, when inserting briquettes into the oven, the vents of the briquettes inserted into the oven must be aligned with the vents of the briquettes to be inserted. . In the briquette and the oven to improve the briquette replacement function of the present invention, the cylindrical briquette having a plurality of vent holes vertically formed to penetrate the upper surface and the lower surface, and in the cylindrical oven to accommodate the briquettes, At least one guide groove is formed on the outer circumferential surface of the briquettes in a length (vertical) direction so as to easily match the vent holes of the briquettes inserted into the oven when the briquettes are inserted into the oven. Guide protrusions are formed on the inner circumferential surface of the oven to correspond to the guide grooves formed on the briquettes, and the vent holes of the briquettes inserted into the lower side by moving the guide grooves formed on the briquettes along the guide protrusions formed on the oven when the briquettes are inserted into the oven. To match.
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