also: モチはモチや
expression
every man knows his own business best; one should go to specialists for the best results
Proverb meaning that for any task, it's best to rely on an expert in that field, just as you would go to a rice cake shop for rice cakes.
See also: 餅
餅は餅屋で、法律のことは弁護士に任せたほうがいい。
As the saying goes, 'for rice cakes, the rice cake shop' — you should leave legal matters to a lawyer.
A traditional Japanese proverb. The literal meaning is 'for rice cakes, (go to) the rice cake shop,' implying that specialists are best at their own craft.