N.H. Rev. Stat. Ann. § 491:1

The superior court shall consist of a chief justice, appointed by the governor and council to a 5-year term, and 22 associate justices. Said justices shall be appointed and commissioned as prescribed by the constitution and shall exercise the powers of the court unless otherwise provided. The chief justice shall be appointed from among the associate justices. In the event that the chief justice resigns as chief justice or is not reappointed at the expiration of the 5-year term, he or she may return to the position of associate justice, whether or not an associate justice vacancy then exists.