(For a Parliamentary graphic click tmsnrt.rs/2rWjPPp)
Government spokesman Christophe Castaner said the high abstention rate - more than 50 percent of voters stayed at home - was a failure for the governing class and highlighted the need for a new politics.
"The real victory wasn't last night, it will be in five years' time when we have really changed things," Castaner told RTL radio.
He also said dissent would not be tolerated among the dozens elected on the Macron party ticket, including many newcomers such as 24-year-old law school graduate Typhanie Degois.
"Being a member of parliament for Republic on the Move is a commitment to Emmanuel Macron's presidential program. It's about loyalty," he said, adding that the previous Socialist government was dogged by dissenters pursuing personal goals.
Though lower than forecast by pollsters, Macron's majority swept aside France's main traditional parties, humiliating the Socialists and conservative The Republicans party that had alternated in power for decades.Read more at Reuters