Abstract: In a manufacturing method of a tailored blank including a first steel plate and a second steel plate to be joined by butt welding, the first and second steel plates are butt welded with a laser beam. The laser beam has a power density q1 in a first region, a power density q2 in a second region, a power density q3 in a third region, and a power density q4 in a fourth region. The power density q1, the power density q2, the power density q3, and the power density q4 satisfy a relationship of q1>q2>q3>q4.

Abstract: A manufacturing method of a component includes a method for welding base materials with each other by laser welding, in which welding is performed by irradiating a laser beam along a welding line. The manufacturing method of a component includes, before starting the welding along the welding line, increasing an output power of the laser beam, while repeatedly moving an irradiation position of the laser beam in a neighborhood of a start point of the welding line, repeatedly moving the irradiation position of the laser beam at least between a first point and a second point. The first point is the start point. The second point is different from the first point.