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1. A stretchable substrate comprising: a plurality of cells formed in a substrate body allowing a device to mounted thereon; a cut portion formed in the substrate body to increase a distance between the cells when the substrate body is stretched; and an extended cutting line extending from an end portion of the cut portion and bent inwardly of the cells cell so that corners of the cells are rounded, wherein: the cut portion includes: a first basic cutting line formed on the substrate body in a first direction: a second basic cutting line formed on the substrate body in a second direction intersecting the first direction, wherein the second basic cutting line includes a first portion and a second portion that are symmetrically disposed on both sides of the first basic cutting line and are spaced apart from each other with interposing the first basic cutting line, and the second basic cutting line is spaced apart from the first basic cutting line; and a plurality of sub-cutting lines extending along the edge of the cell in an inside of the cell and not connected to each other but spaced apart from each other, wherein the extended cutting line is formed at an end portion of each of the sub-cutting lines; wherein, the extended cutting line formed in cells formed in first and third quadrants based on the first and second basic cutting lines.
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