Before reaching his majority Carey joined his father as a member of Prince Charles’s Household, and was sent to accompany Sir John Digby* on a diplomatic journey to Spain in 1617. He went abroad again, to France and Germany two years later, and in 1621 rounded off his education by entering Parliament, presumably on the nomination of his Court acquaintance, the 2nd earl of Hertford (William Seymour*), at a by-election to replace (Sir) Giles Mompesson*, who had been expelled. Carey left no trace on the parliamentary records. In 1623 he followed Prince Charles and Buckingham to Madrid over land, setting off a week before his father.
Sustained by his father’s post as Charles’s chamberlain and his mother’s connections with the local gentry, Carey sat for duchy of Cornwall constituencies in the next four parliaments. He was nominated for Grampound by the prince’s Council in 1624, but failed to make good his candidature in the face of powerful local interests, and ultimately found a seat at Helston via his cousin’s husband Sir Francis Godolphin*.
Carey retained his post in the new reign with a pension of £500, and was re-elected for Helston, but no parliamentary activity is recorded for him in 1625.
In 1631 it was reported that Carey was to go as ambassador to France. Nothing came of this, but three years later, on being designated for Venice, he went so far as to let his house in the Strand to Carlisle at the considerable rent of £150.
