An inhaler for inhalation of an inhalable dry powder, the inhaler comprising:- (a) an outer shell comprising a first shell part and a second shell part; (b) a capsule holder comprising a chamber for holding a capsule, a capsule breaker for breaking open a capsule held within the chamber and a trigger for causing the capsule breaker to break open a capsule; (c) a support for supporting the capsule holder; and (d) an outlet for passage of dry powder from the capsule into a user, wherein the capsule holder is positioned in the first shell part, wherein the first shell part comprises an aperture through which the trigger protrudes, wherein the aperture comprises a cut-out in the rim of the first shell part and through which the trigger may pass when the capsule holder is removed from the first shell part, and wherein the support comprises one or more first mating parts (19a, 19b) for mating with one or more second mating parts (20a, 20b) on the first shell part, said first (19a, 19b) and second (20a, 20b) mating parts preventing outward movement of the walls of the first shell part when said first (19a, 19b) and second (20a, 20b) mating parts are mutually engaged, wherein the one or more first mating parts (19a, 19b) comprise one or more male mating parts and the one or more second mating parts (20a, 20b) comprise one or more female mating parts, characterized in that the one or more female mating parts (20a, 20b) are formed in a thickened part of the outer wall of the first shell part wherein the thickened part of the outer wall at least partially surrounds the cut-out and/or the aperture. (a) an outer shell comprising a first shell part and a second shell part; (b) a capsule holder comprising a chamber for holding a capsule, a capsule breaker for breaking open a capsule held within the chamber and a trigger for causing the capsule breaker to break open a capsule; (c) a support for supporting the capsule holder; and (d) an outlet for passage of dry powder from the capsule into a user, wherein the capsule holder is positioned in the first shell part, wherein the first shell part comprises an aperture through which the trigger protrudes, wherein the aperture comprises a cut-out in the rim of the first shell part and through which the trigger may pass when the capsule holder is removed from the first shell part, and wherein the support comprises one or more first mating parts (19a, 19b) for mating with one or more second mating parts (20a, 20b) on the first shell part, said first (19a, 19b) and second (20a, 20b) mating parts preventing outward movement of the walls of the first shell part when said first (19a, 19b) and second (20a, 20b) mating parts are mutually engaged, wherein the capsule holder is positioned in the first shell part, wherein the first shell part comprises an aperture through which the trigger protrudes, wherein the aperture comprises a cut-out in the rim of the first shell part and through which the trigger may pass when the capsule holder is removed from the first shell part, and wherein the support comprises one or more first mating parts (19a, 19b) for mating with one or more second mating parts (20a, 20b) on the first shell part, said first (19a, 19b) and second (20a, 20b) mating parts preventing outward movement of the walls of the first shell part when said first (19a, 19b) and second (20a, 20b) mating parts are mutually engaged,