An inhaler suitable for delivery of the medicament in dry powder form from a blister package composed of a plurality of blister pockets each of which comprises medicament in dry powder form and which are spaced at equal intervals; said inhaler comprising: - a mouthpiece enabling the patient to inhale the medicament in dry powder form from the opened blister pocket, - a gear mechanism enabling the blister package to be indexed and the medicament in dry powder form to become ready for inhalation, - a winding wheel which is a member of the gear mechanism and on which the lid sheet of the blister pack is coiled, wherein each of resilient wings of the winding wheel extending from the center to the end of the winding wheel on which the lid sheet of the blister package that is indexed and peeled upon the actuation of the inhaler is coiled is comprised of 3 parts (A, B, C); and the average radius of the second one of these parts (A, B, C) of each resilient wings concatenating from the center to the end of the winding wheel is in the range of 4,60 mm to 5,20 mm; and the radius of the piece of the third part that curls through the end of the resilient wing is in the range of 0,9 mm to 1,70 mm, - a rotatable mouthpiece cover covering the mouthpiece; - a housing situated between the upper housing member and the lower housing member in which the blister package and the gear mechanism are enclosed characterized in that the mouthpiece cover can solely be in two positions: the mouthpiece is completely covered and the device is on standby mode when the mouthpiece cover is in the first position, one dose of the medicament in dry powder form is ready for inhalation upon the actuation of the device when the mouthpiece cover is in the second position. - a mouthpiece enabling the patient to inhale the medicament in dry powder form from the opened blister pocket, - a gear mechanism enabling the blister package to be indexed and the medicament in dry powder form to become ready for inhalation, - a winding wheel which is a member of the gear mechanism and on which the lid sheet of the blister pack is coiled, wherein each of resilient wings of the winding wheel extending from the center to the end of the winding wheel on which the lid sheet of the blister package that is indexed and peeled upon the actuation of the inhaler is coiled is comprised of 3 parts (A, B, C); and the average radius of the second one of these parts (A, B, C) of each resilient wings concatenating from the center to the end of the winding wheel is in the range of 4,60 mm to 5,20 mm; and the radius of the piece of the third part that curls through the end of the resilient wing is in the range of 0,9 mm to 1,70 mm, - a rotatable mouthpiece cover covering the mouthpiece; - a housing situated between the upper housing member and the lower housing member in which the blister package and the gear mechanism are enclosed characterized in that the mouthpiece cover can solely be in two positions: the mouthpiece is completely covered and the device is on standby mode when the mouthpiece cover is in the first position, one dose of the medicament in dry powder form is ready for inhalation upon the actuation of the device when the mouthpiece cover is in the second position. the mouthpiece is completely covered and the device is on standby mode when the mouthpiece cover is in the first position, one dose of the medicament in dry powder form is ready for inhalation upon the actuation of the device when the mouthpiece cover is in the second position.