conjunction
then; if so; if that is the case
Used to present a logical conclusion or hypothetical result based on a preceding statement. Similar to とすると, but slightly more formal or written.
See also: とすると
彼が来ないとすれば、会議は延期だ。
If he doesn't come, then the meeting will be postponed.
それが本当だとすれば、大変なことだ。
If that is true, then it's a serious matter.