Provided is a spunbonded nonwoven fabric, including a fiber formed of a composition containing: a propylene homopolymer having a melting point of 140°C or higher； a polyethylene； and at least one polymer selected from the group consisting of a polymer shown in (I), and a polymer shown in (II), in which the fiber has a sea-island structure, and an average length of an island phase is from 1 µm to 500 µm in a cross section taken along a major axis direction of the fiber, and a method for producing thereof, and in which the polymer shown in (I) is a random copolymer of a propylene with α-olefin having specified number of carbon atoms and the polymer shown in (II) is a propylene homopolymer having a melting point of less than 120°C satisfying the specified properties.
