Quebec's campaigning politicians appealed to workers on Labour Day Monday, with two different parties promising to raise the minimum wage to $15 per hour.

On Day 12 of the provincial election campaign, Parti Quebecois Leader Jean-Francois Lisee said the starting wage would be raised gradually from the current rate of $12 per hour.

Lisee said his party had always been close to workers, despite the fact that his predecessor, media magnate Pierre Karl Peladeau, presided over lenthy labour disputes with two of the newspapers in his chain.

Peladeau led the party from 2015 to 2016 before quitting politics for family reasons.

Lisee acknowledged that that the party's pro-worker stance might be more apparent in the absence of its former leader, while denying anything had fundamentally changed with the party that has traditionally been a favourite choice of the province's unions.

"It might have been harder to see, with the last leader, but the party itself, the members themselves, our closeness towards those who work hard has always been there, and perhaps it's more apparent now," Lisee said at a news conference where he also unrolled a plan to create a group insurance plan for the self-employed.

The left-wing party Quebec solidaire also expressed its commitment to a $15 minimum wage, which the party has long called for and would implement in 2019 if elected, co-spokesperson Manon Masse said Monday, detailing the plan.

The party would also invest $100 million per year over five years to help smaller businesses, farmers and community organizations adjust to the change, Masse announced in Gatineau.