Going purely by our Constitution, technically all Ministers of State - that's all 42 people currently listed at https://www.aph.gov.au/about_parliament/parliame

Going purely by our Constitution, technically all Ministers of State - that's all 42 people currently listed at https://www.aph.gov.au/about_parliament/parliamentary_departments/parliamentary_library/parliamentary_handbook/current_ministry_list https://www.aph.gov.au/about_parliament/parliamentary_depart... - equally share Executive power (and technically they themselves have no power, they can only advise the Queen, and her representative, the Governor-General, who are the ones with the actual power). However, as with everything in the Westminster system, the written law is only part of the picture, and by convention, we have one Minister to rule them all, and he/she exercises actual Executive power.