A noise filter device includes a ground connection terminal (21) for grounding, a coil (31) formed by winding a conductive wire (33), a pair of capacitors (41) constituting a π-type filter circuit C together with the coil (31) and to be electrically connected to the ground connection terminal (21), and a housing (11) capable of housing the coil (31) and the pair of capacitors (41). The capacitors are both arranged on one surface side of a virtual plane dividing the coil into two in an axial direction, and a conductive shielding plate (24B) to be grounded to the ground connection terminal (21) is interposed between the capacitors (41).