Abstract: [Means for Solution] A gear member includes a tooth having a tooth flank whose profile is an involute curve, wherein in a cross-section of the tooth perpendicular to a face width direction, the tooth has a depression, near a top land, hollowed in the tooth flank relative to the involute curve.

Abstract: Provided is a shell composition that is formed with a water-insoluble powder such as starch and/or a water-soluble polymer such as dextrin as a base component, and with locust bean gum and/or xanthan gum as a gelling agent. This shell composition enables a novel shell composition which can favorably form a shell without using carrageenan, has favorable properties that enable the shell composition to substitute traditional shells that use a gelatin shell or carrageenan, and comprises a plant-derived base.