on the contrary vs to the contrary

on the contrary and to the contrary both are adverbs.

Word	Noun	Adjective	Verb	Adverb
on the contrary	No	No	No	Yes
to the contrary	No	No	No	Yes

As adverbs, on the contrary and to the contrary are synonyms defined as:

Other synonyms of on the contrary include contrarily, contrariwise.

on the contrary (adverb)	to the contrary (adverb)
contrary to expectations	contrary to expectations