A mattress structure contains: an elastic mattress. The elastic mattress includes a main body, 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 is made of plural first plastic wires which are solid and are irregularly winded together, 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 formed therein. The elastic mattress also includes two support areas arranged below the two elongated extensions, and each support areas has 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.