Investments (Tables)

12 Months Ended

Dec. 31, 2011

Available-for-Sale Securities

The cost, gross unrealized holding gains, gross unrealized holding losses and fair value for available-for-sale securities included in short-term investments and investments by major security type at December 31, 2011 and 2010 were as follows:

	December 31, 2011
	Cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
	(Millions of yen)
Current:
Corporate bonds	¥	20	¥	—	¥	—	¥	20
Noncurrent:
Government bonds	¥	172	¥	—	¥	22	¥	150
Corporate bonds		569		73		84		558
Fund trusts		1,867		2		43		1,826
Equity securities		15,911		3,200		1,387		17,724
	¥	18,519	¥	3,275	¥	1,536	¥	20,258
	December 31, 2010
	Cost		Gross unrealized holding gains		Gross unrealized holding losses		Fair value
	(Millions of yen)
Current:
Government bonds	¥	1	¥	—	¥	—	¥	1
Corporate bonds		1,000		—		—		1,000
	¥	1,001	¥	—	¥	—	¥	1,001
Noncurrent:
Government bonds	¥	183	¥	—	¥	22	¥	161
Corporate bonds		1,017		42		65		994
Fund trusts		1,778		20		—		1,798
Equity securities		18,288		5,768		654		23,402
	¥	21,266	¥	5,830	¥	741	¥	26,355

Maturities of Available-for-SaleDebt Securities and FundTrusts

Maturities of available-for-sale debt securities and fund trusts included in short-term investments and investments in the accompanying consolidated balance sheets were as follows at December 31, 2011:

	Cost		Fair value
	(Millions of yen)
Due within one year	¥	20	¥	20
Due after one year through five years		962		926
Due after five years through ten years		1,646		1,608
	¥	2,628	¥	2,554