"Campaign Daily Budget" is the daily available amount set at the campaign level.
Tips
	
Campaign daily budget is required.
	
Campaign daily budget is available from 100 JPY in 100 JPY unit.
	
The system divides the daily budget and controls ads to be delivered throughout the day (24 hours) to meet the budget set.
	
One day starts from 0:00 AM to 11:59 PM (JST) to calculate campaign daily budget.
	
Campaign daily budget shown in the Campaign Management Tool doesn't include tax.
	
In typical case, about 50% of the campaign daily budget is used in the first half of the day, and the rest in second half. About 70% of the campaign daily budget maybe used  in the first half of the day as a result of intensive clicks caused by seasonal or media impact.
Note
Campaign daily budget is an approximate, and the exceeded amount is not guaranteed to be refunded. If the bid for keywords/ad groups are relatively high for the campaign daily budget, actual click cost may exceed the budget when intensive click occurs caused by seasonal/media information.
We encourage advertisers to set a balanced campaign daily budget and bids.
Please refer to the following page for the campaign daily budget and monthly charging limit.
Search Ads Campaign Daily Budget and Monthly Charging Limit
If the Budget is Changed in Mid-day
How to Change Campaign Daily Budget
If the Budget is Changed in the mid-day
If you change the campaign daily budget in the mid-day, method of controlling the frequency of ad display is different depending on the timing/number of the times it has been changed.
Changed once in a mid-day
For example, campaign daily budget is changed around noon, the cost spent in the morning is added to the 50% of the new budget in the afternoon. 
As a result, the total cost of the day could be slightly higher than the budget before/after changed. Though exceeding the campaign daily Budget set, monthly charging limit basically does not exceed. Please check the following page for how to count the monthly limit. 
Campaign Daily Budget and Monthly Charging Limit
Changed more than twice in a middle of the day
Ads are delivered based on the highest campaign daily budget set in the day.
Note
	
If the “Hours” of “Day of Week / Hours” targeting is set, ads will be displayed to spend the amount based on above budget in the targeted hours.
	
If the daily budget is dramatically decreased, ads may not be displayed for the rest of the day.
	
If the changed budget amount has already been spent by the time the change was made, your ads may not be displayed.
How to Change Campaign Daily Budget
Campaign settings can be set by following the steps below.
Steps
	
Click the [Search Ads] tab of the Campaign Management Tool.
	
Click [Administration] sub-tab.
	
Select an Account name from Account list. 
	
Select a Campaign Name on left Navigation area.
	
Click "Submit" next to the "Campaign Daily Spending Limit" amount in Campaign Overview section on the top-side of the screen. 
	
Change the budget amount from the "Campaign Daily Spending Limit" box.

Tips
More than 100 JPY in 100 JPY increments.
	
Click "Save Changes" once you reconfirmed the changes on settings.