A nasal delivery device for delivering particulate substance to the nasal airway of a subject, the delivery device comprising: a mouthpiece unit (209) which includes a mouthpiece (247) through which the subject in use exhales; a nosepiece unit (205) which includes a nosepiece (241) for fitting to a nostril of the subject; a substance-supply unit (211) which is configured to receive a container (C) containing particulate substance, the container (C) comprising a main body part (215) and first and second bearing support parts (217, 217) at the respective ends of the body part (215), and operable to provide a metered amount of substance in fluid communication with the mouthpiece and nosepiece units (209, 205), such that an exhalation air flow delivered through the substance-supply unit (211) entrains the substance; and a housing (203) which supports the mouthpiece unit (209), the nosepiece unit (205) and the substance-supply unit (211); wherein the substance-supply unit (211) includes a container-receiving member (251) which is movably disposed to the housing (203) between an open position for enabling loading of a container (C) thereinto and a closed position in which the container (C) is contained within the housing (203), and the container-receiving member (251) includes a cavity (253) which defines an air flow channel between the mouthpiece and nosepiece units (209, 205), such that an air flow is delivered therethrough on exhalation by the subject through the mouthpiece (247), and a support section for supporting the container (C) in the cavity (253) which includes first and second container supports (255, 255) for rotatably supporting the respective support parts (217, 217) of the container (C).