Magnetic fields are induced using high-energy electron currents produced by laser-plasma interactions. Guiding high-energy electron beams, insulating electron heat transport and so on are brought about by the circular motion of electrons around magnetic field lines in the laser-plasma interactions. Recently, strong magnetic fields up to 1 kT can be produced by the interaction of plasmas with power lasers. The behavior of laser-produced plasmas can be controlled by the strong magnetic fields. In this issue, we will show the present status and perspective of the research on the generation of strong magnetic field using power lasers and its applications.