Multilayer coil component

A multilayer coil component comprising:

• a multilayer body in which a plurality of insulating layers are stacked in a stacking direction, and a coil inside the multilayer body;
• and
• outer electrodes that are on surfaces of the multilayer body and are electrically connected to the coil,
• wherein
• the multilayer body has a first end surface and a second end surface, which face each other in a length direction, a first main surface and a second main surface, which face each other in a height direction perpendicular to the length direction, and a first side surface and a second side surface, which face each other in a width direction perpendicular to the length direction and the height direction,
• the outer electrodes include a first outer electrode that extends from at least part of the first end surface of the multilayer body across part of the first main surface, and a second outer electrode that extends from at least part of the second end surface of the multilayer body across part of the first main surface,
• a stacking direction of the plurality of insulating layers in the multilayer body and a coil axis direction of the coil are parallel to the first main surface,
• the insulating layers have a magnetic phase having a spinel structure containing at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si,
• when grain sizes D50 and D90 of crystal grains constituting the magnetic phase are respectively defined as equivalent-area circle diameters of 50% and 90% on a cumulative sum basis in a cumulative distribution of equivalent-area circle diameters of the crystal grains,
• the grain size D50 is from 50 nm to 750 nm, and
• the grain size D90 is from 200 nm to 1500 nm,
• wherein the insulating layers contain
• B at from 2 wt % to 11 wt % in terms of B2O3,
• Si at from 18 wt % to 66 wt % in terms of SiO2,
• Fe at from 13 wt % to 52 wt % in terms of Fe2O3,
• Ni at from 1 wt % to 7 wt % in terms of NiO,
• Zn at from 4 wt % to 16 wt % in terms of ZnO, and
• Cu at from 1 wt % to 5 wt % in terms of CuO.