関ジャニ∞ (Kanjani8) is a seven member idol group under Johnny's Entertainment. Their record company is Teichiku Entertainment.

The members are:

錦戸亮* (Nishikido Ryo - yellow ranger)

大倉忠義 (Ohkura Tadayoshi - green ranger)

村上信五 (Murakami Shingo - purple ranger)

丸山隆平 (Maruyama Ryuhei - orange ranger)

安田章大 (Yasuda Shota - blue ranger)

渋谷すばる (Shibutani Subaru - red ranger)

横山裕 (Yokoyama You - black ranger)

Ex-member:

内博貴 (Uchi Hiroki - He has never been a ranger, because he left before they started as rangers)

The members are known for being very close, possibly even the closest in all of Johnny's, shown by their annual barbecues and birthday celebrations together. In concerts they have been known to dress up as "Kanjani Sentai 8 Ranger" and do skits. Their ranger outfits of course are in their image colors.

In December 2002 the group was created out of members of Kansai Juniors. At the time, the 7 members excluding Ōkura Tadayoshi were appearing on the TV program "J3 KANSAI" on Kansai TV. In the Kansai area, Kansai TV is on channel 8, so Johnny Kitagawa added another member, Ōkura Tadayoshi, to match the channel number. Shortly after their formation, they held their first concert, titled "Kanjani8 Xmas Party 2002" at the Osaka Shouchikuza theater, where they performed their first song as an 8-member group, Do you agree?.

On August 25th, 2004 they released their first single, Naniwa Iroha Bushi which was first limited to the Kansai area but later (September 22nd) was released nationally as well. The limited-release CD debuted at a record #1 on the Oricon Enka chart, and a #8 on the overall chart. The nationwide release reached #1 on both the Enka and overall charts. At this time, the numerical "8" in their name was turned onto its side and made into an infinity symbol (∞).

In 2005, Uchi Hiroki was suspended from all activities with 関ジャニ∞ due to an underaged drinking incident. Other than a part in the musical PLAYZONE, Uchi Hiroki had remained away from the public eye. In 2007 he was brought onstage during a 関ジャニ∞ concert where the members welcomed him back as a member of their unit, although there was no official statement at the time.

* 錦戸亮 is also a former member of the Johnny's group News.

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