The Japanese company reported net profit of Y2.01 billion for the quarter ended 31 March, up from Y1.54 billion, as revenue increased to Y41.86 billion from Y40.26 billion.
Operating profit rose to Y2.87 billion from Y2.27 billion, while pretax profit increased to Y3.00 billion from Y2.37 billion.
Per-share earnings climbed to Y242.55 from Y185.72, with the results prepared under Japanese accounting standards.
Amid record profits, can Japan's construction boom withstand soaring energy costs and a weakening yen?
As Japan's population shrinks, who will build and maintain the massive infrastructure projects currently underway?