…most of the time. This is because it whizzes around the sun every 88 days, so it often gets itself closer to us than the Venus, which is supposed to be our nearest neighbour. Mercury does this more often than it doesn’t, if you know what I mean.
While this may be a bit mind-blowing….wait – there’s more. Mercury is also, on average, the closest planet to every other planet in the solar system. The attached article and video explains everything.
https://www.popularmechanics.com/space/solar-system/a26839314/closest-planet-to-earth-on-average/