The invention relates to the field of inhalant devices, in particular to an inhalant device favorable for inhalant to enter deep part of lung. The device comprises a shell, the shell is provided witha storage part used for containing a medicine storage tank and an inhalation part used for inhaling medicine by a patient. The inhalant device further comprises a threshold switch, the threshold switch has a braking state and an opening state, the threshold value of the threshold switch is matched with the value of negative pressure generated in the inhalation part when the patient inhales from the inhalation part, and when the threshold switch is in the braking state, the medicine is stopped, so that the patient cannot inhale the medicine through the inhalation part; and when the value of thenegative pressure generated when the patient inhales from the inhalation part is equal to or larger than the threshold value, the threshold value switch is changed from the braking state to the opening state and kept in the opening state, and the patient can inhale the medicine from the inhalation part. In the scheme of the invention, the medicine can enter the lung at a relatively high flow rate, so that a good medicine supply effect and a good treatment effect can be achieved, and the adverse reaction risk of medicament use is greatly reduced.