De Bois, a Conservative MP who heads the cross-party group set up in early 2011, told C&IT that he aims to hand over to a successor within the year.
But Simon Hughes, who next month succeeds Rob Allen as chairman of industry body Eventia, said de Bois' plan to step down marked a potential "hiatus" for the industry's political representation as no successor has yet been billed.
De Bois downplayed the news: "I think it would be very curious if I remained chairman for the life of a parliament in my role," he said. "The APPG is not dependent upon one individual. It needs to reach across both houses of parliament and all constituencies. It's important to have a high turnover of members so that they can go on to spread the message in whichever job they are involved in afterwards."
Michael Hirst, who, as chair of Business Visits & Events Partnership and campaign co-ordinator of Britain for Events, works closely with De Bois, added: "We'd like to have a number of parliamentarians who get involved and move on, that way they can bring what they've learnt in the APPG to other committees."
Hughes said that Eventia would consider funding a retained parliamentary adviser for the trade body.
Read Simon Hughes' Masterplan in C&IT, p29.