A mattress structure comprising:an elastic mattress, and the elastic mattress including a main body with a predetermined thickness, two elongated extensions extending along two peripheral sides of the main body, and an outer segment formed on one end thereof to correspond to user's feet, the elastic mattress being made of plural first plastic wires which are solid and are irregularly winded together, wherein a connection portion of at least two of the plural first plastic wires is melted, and a disconnection portion of the at least two of the plural first plastic wires includes plural gaps of various sizes formed therein; andthe elastic mattress also including two support areas arranged below the two elongated extensions, and each of the two support areas having plural second plastic wires winded therein, wherein a density of the plural second plastic wires is greater than those of the other positions of the elastic mattress besides the two support areas, and plural voids are formed in each support areas, wherein a size of each void is less than that of each gap, such that an elasticity of each support area is less than that of the main body.