A battery pack may include a component housed in a case. The component may include an adhesion projection and a first guide projection projecting from a bottom surface of the component. The first guide projection may include: a first portion overlapping the adhesion projection; and a second portion not overlapping the first portion. A projection degree of the first portion may be greater than or equal to a projection degree of the adhesion projection. The second portion may include an inclined portion, wherein a projection degree of the inclined portion increases toward the first portion so that a projection degree of the second portion increases from a value lower than the projection degree of the adhesion projection to a value greater than or equal to the projection degree of the adhesion projection. An end surface of the adhesion projection may be adhered to the inner surface.