The monthly poll, which tracks the Bank of Japan's (BOJ) closely-watched tankan quarterly survey, found manufacturers' mood up a tad from three months ago and service-sector morale holding steady, signalling a firm reading in the upcoming BOJ tankan.
Solid tankan results should be encouraging for the BOJ, which will scrutinise the survey readings, due Dec. 15, at its policy meeting later this month. Investors are expecting the central bank to maintain the current easing stance for now.
"Sentiment in both manufacturing and non-manufacturing remained elevated and that the outlook was also firm, reflecting strong domestic and overseas demand," said Yuicihro Nagai, economist at Barclays Securities.
"We expect the BOJ tankan index for large manufacturers to rise by one point to 23 in December, while the index for large non-manufacturers holds at 23."
In the Reuters poll of 547 large- and mid-sized companies, in which 251 firms responded, the manufacturers' index was seen inching up in March while the service-sector mood was believed likely to slip but remain at relatively high levels.
"Following growing interest in AI (artificial intelligence) and IoT (Internet of Things), we are receiving increasing inquiries from manufacturers about automation and efficiency," an electrical equipment maker wrote in the survey, in which companies respond on condition of anonymity.
Another electrical equipment maker wrote: "The U.S. car market is maintaining sound performance even though it shows some signs of declining."
The sentiment index for manufacturers stood at 27, unchanged from November after hitting a decade-high of 31 in October, according to the survey conducted Nov. 21 to Dec. 4.
The manufacturers' index was up two points compared with three months ago, on gains among industries such as electrical equipment, oil refinery/ceramics and steel/nonferrous metals. The index is expected to rise further to 28 in March.
The service-sector index rose to 34 from 31 in November, led by gains in retailers, an encouraging sign for private consumption that constitutes some 60 percent of the economy.
The level was unchanged compared from September when it hit a two-year high. The index is expected to fall to 31 in March.
The BOJ's last tankan showed big manufacturers were the most optimistic for the business outlook in a decade.
Japan's economy expanded for a seventh straight quarter in the July-September period led by solid external demand, with steady growth seen likely to continue in the coming year.
(Reporting by Tetsushi Kajimoto; Editing by Eric Meijer)
By Tetsushi Kajimoto and Izumi Nakagawa