The key gauge of the current state of the economy stayed above the boom-or-bust threshold of 50 percent in June for the third straight month, the government said Monday.
The index of coincident economic indicators registered 88.9 percent, the Cabinet Office said in a preliminary report.
A reading above 50 percent is considered a sign of economic expansion, while a figure below that line is seen as a sign of contraction.
Of the 11 indicators used to calculate the coincident index, nine were available for the preliminary report and eight showed positive readings.
Of the eight, industrial production and large-lot electricity use hit record highs in June.
However, the index of leading indicators, which predicts economic developments about six months down the road, registered 50.0 percent. It came in above 50 percent in April and May.