Abstract: A manufacturing method for an optical connector includes inserting and fixing a multi-core fiber into a ferrule, wherein at least one of a plurality of cores of the multi-core fiber is a spiral core, inserting the ferrule into a housing and aligning the cores with the housing around a central axis of the multi-core fiber, and obliquely polishing the ferrule until a width of an end surface of the ferrule perpendicular to a direction of the central axis reaches a predefined width.

Abstract: The toner contains binder resin-containing toner particles and silica fine particle S1, wherein the weight-average particle diameter of the toner is 4.0-15.0 ?m, both inclusive, peaks originating with the silica fine particle S1 are observed in 29 Si-NMR measurement of the silica fine particle S1, and, in the spectrum obtained by 29Si CP/MAS NMR or 29Si DD/MAS NMR, the peak area of a peak corresponding to the D1 unit structure in the silica fine particle S1, the peak area of a peak corresponding to the D2 unit structure in the silica fine particle S1, and the peak area of a peak corresponding to the Q unit structure in the silica fine particle S1 satisfy a prescribed relationship.

Abstract: An inter-component connection structure includes a male fitting member; and a female fitting member that has a first nipping portion and a second nipping portion disposed to face each other, and nips an insertion portion of the male fitting member inserted between the first nipping portion and the second nipping portion. A pair of the male fitting member and the female fitting member is disposed in different components. The first nipping portion and the second nipping portion are respectively bent to form protruding portions toward surfaces thereof facing each other. A gap is provided at a tip portion of each of the first nipping portion and the second nipping portion. In at least one of the pair of the male fitting member and the female fitting member, an insulating portion is provided in a region that is not in contact with the other when fitted.